# 3p0x1b CDC Vol 2 (2016)

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| By Don
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Don
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Quizzes Created: 3 | Total Attempts: 1,721
Questions: 67 | Attempts: 517

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• 1.

### What is the approximate muzzle velocity for the M4 Carbine?

• A.

2970 FPS

• B.

2975 FPS

• C.

3100 FPS

• D.

3500 FPS

A. 2970 FPS
Explanation
The approximate muzzle velocity for the M4 Carbine is 2970 FPS.

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• 2.

### Which assembly houses the trigger assembly, sear, hammer assembly, selector lever, rifle grip, bolt catch, and buttstock assembly?

• A.

Bolt carrier assembly

• B.

Charging handle assembly

• C.

Upper receiver and barrel assembly

• D.

Lower receiver and buttstock assembly

D. Lower receiver and buttstock assembly
Explanation
The lower receiver and buttstock assembly houses various components such as the trigger assembly, sear, hammer assembly, selector lever, rifle grip, bolt catch, and buttstock assembly. These components are essential for the functioning of the firearm. The lower receiver is the main housing for the trigger group and other important parts, while the buttstock assembly provides support and stability for the shooter. Therefore, the lower receiver and buttstock assembly is the correct answer.

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• 3.

### The test or inspection on the M4 carbine for a failure to chamber malfunction requires an inspection of the action spring. What is the free length for the action spring on the M4 Carbine?

• A.

10 1/16 in. 25.56 cm minimum to 11 1/4 in 28.58 max.

• B.

10 1/16 in min to 13 1/2 in max

• C.

11 1/4 min to 11 3/4 max

• D.

11 3/4 min to 13 1/2 max

A. 10 1/16 in. 25.56 cm minimum to 11 1/4 in 28.58 max.
Explanation
The correct answer is 10 1/16 in. 25.56 cm minimum to 11 1/4 in 28.58 max. This is the correct range for the free length of the action spring on the M4 Carbine. The action spring is an important component that helps to cycle the weapon and ensure proper chambering of rounds. By inspecting the action spring within this specified range, any potential failure to chamber malfunction can be identified and addressed.

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• 4.

### You have experienced a short recoil malfunction and found improper gap space in the gas rings. To prevent this from happening again, the bolt rings should be staggered approximately

• A.

1/2 turn apart

• B.

1/3 turn apart

• C.

1/4 turn apart

• D.

1/8 turn apart

B. 1/3 turn apart
Explanation
To prevent a short recoil malfunction caused by improper gap space in the gas rings, the bolt rings should be staggered approximately 1/3 turn apart. This means that each ring should be rotated about one-third of a full turn from the adjacent ring. By staggering the rings in this manner, it helps to ensure a more secure and effective seal, reducing the chances of gas leakage and malfunction during recoil.

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• 5.

### If you replace the bolt carrier key, how many rounds of blank or ball ammunition must be fired to ensure a seal is created?

• A.

3 - 8

• B.

4 - 6

• C.

6 - 8

• D.

8 - 10

A. 3 - 8
Explanation
To ensure a seal is created when replacing the bolt carrier key, it is recommended to fire 3 to 8 rounds of blank or ball ammunition. Firing this number of rounds helps to properly seat the key and create a tight seal, ensuring optimal performance and preventing gas leakage.

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• 6.

### You should never fire blank ammo at a target less than how many feet away from you?

• A.

10 feet

• B.

15 feet

• C.

20 feet

• D.

25 feet

C. 20 feet
Explanation
Firing blank ammo at a target less than 20 feet away is unsafe. Blank ammunition still contains gunpowder and can cause injury or harm if fired at close range. The distance helps to ensure that the force and impact of the blank round is reduced, minimizing the risk of injury to the shooter or others nearby. Therefore, it is important to maintain a minimum distance of 20 feet when using blank ammunition for safety reasons.

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• 7.

### Which is the standard round used in the M16A2 and M4 series weapons and also linked and used in the M249

• A.

Close combat mission capability kit (CCMCK) M1042

• B.

Cartridge, 5.56mm armor piercing (AP) M995

• C.

Cartidge, 5.56mm, tracer, M856

• D.

Cartidge, 5.56mm, ball, M855

D. Cartidge, 5.56mm, ball, M855
Explanation
The correct answer is Cartridge, 5.56mm, ball, M855. This is the standard round used in the M16A2 and M4 series weapons, as well as linked and used in the M249. The M855 ball round is a 5.56mm NATO cartridge that is commonly used by the United States military. It is designed for general-purpose use and has a full metal jacket with a lead core. The M855 round provides good accuracy and penetration, making it suitable for a variety of combat situations.

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• 8.

### Cartridge, 5.56mm, tracer, M856 should not be used in the M16A1 except under emergency conditions and only at targets less than how many meters in distance?

• A.

60

• B.

70

• C.

80

• D.

90

D. 90
Explanation
Cartridge, 5.56mm, tracer, M856 should not be used in the M16A1 except under emergency conditions and only at targets less than 90 meters in distance. This suggests that the M856 tracer round has certain limitations or risks associated with its use in the M16A1 rifle. It is important to use this type of ammunition cautiously and only in specific situations where the target is within a certain range to ensure safety and effectiveness.

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• 9.

### If adequate range facilities are not available for sustainment training, short range training ammo (SRTA) can be used for any firing exercise of

• A.

15 meters or less

• B.

20 feet or less

• C.

25 meters or less

• D.

30 feet or less

C. 25 meters or less
Explanation
The correct answer is 25 meters or less. This means that if there are not enough range facilities for sustainment training, short range training ammo (SRTA) can be used for any firing exercise within a distance of 25 meters or less. This allows for training to still take place even without access to longer range facilities.

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• 10.

### Which part of the M9 pistol sits between the firing pin striker and the firing pin?

• A.

Trigger block

• B.

Hammer block

• C.

Firing pin block

• D.

Slide stop

C. Firing pin block
Explanation
The firing pin block is the part of the M9 pistol that sits between the firing pin striker and the firing pin. It is designed to prevent the firing pin from moving forward and striking the primer of a cartridge unless the trigger is pulled. This safety feature helps to prevent accidental discharges and ensures that the firearm can only be fired when intended.

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• 11.

### Thinking weapons nomenclature, which button is located on the right side of the receiver, above and ahead of the trigger guard

• A.

Magazine release button

• B.

Disassembly button

• C.

Extractor button

• D.

Slide stop button

B. Disassembly button
Explanation
The correct answer is the disassembly button. In weapons nomenclature, the disassembly button is typically located on the right side of the receiver, above and ahead of the trigger guard. This button is used to disassemble the weapon for cleaning, maintenance, or repair purposes. The magazine release button, extractor button, and slide stop button are all different components of a firearm, but they are not located in the same position as described in the question.

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• 12.

### The slide of your M9 pistol does not lock fully forward. What is the probably malfunction?

• A.

The locking block and lugs are cracked/burred or broken

• B.

The extractor is worn or broken

• C.

The firing pin block is broken

• D.

The feed ramp is damaged

A. The locking block and lugs are cracked/burred or broken
Explanation
The most likely malfunction in this scenario is that the locking block and lugs are cracked, burred, or broken. This would prevent the slide of the M9 pistol from fully locking forward. The locking block and lugs are crucial components that ensure the proper functioning of the slide, so any damage or breakage in these parts would cause the malfunction described.

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• 13.

### The free length of the M9 Pistol recoil spring should not be less than

• A.

5 inches

• B.

7 Inches

• C.

9 inches

• D.

11 inches

A. 5 inches
Explanation
The correct answer is 5 inches because the free length of the M9 Pistol recoil spring should not be less than this measurement. This length is necessary to ensure proper functioning and reliability of the pistol. A shorter recoil spring could result in insufficient energy absorption and could potentially cause malfunctions or failures in the firearm's operation. Therefore, it is important to adhere to the recommended minimum length of 5 inches for the recoil spring.

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• 14.

### You must replace the barrel of the M9 pistol if you find pitting in the bore area that exceeds

• A.

Two land in width and 1/8 in. in length

• B.

Two land in width and 3/8 in. in length

• C.

One land in width and 3/8 in. in length

• D.

One land in width and 1/8 in in length

C. One land in width and 3/8 in. in length
Explanation
If pitting in the bore area of the M9 pistol exceeds one land in width and 3/8 in. in length, the barrel must be replaced. This indicates significant damage to the barrel that could affect the performance and accuracy of the pistol. Pitting refers to the formation of small holes or depressions on the surface of the bore, which can be caused by corrosion or wear. The specified measurements indicate the severity of the pitting, with a wider width and longer length indicating more extensive damage.

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• 15.

### Which cycle of operation of the M9 pistol occurs after the round is fired and the recoil causes the barrel and slide to move rearward?

• A.

Firing

• B.

Extracting

• C.

Locking

• D.

Unlocking

D. Unlocking
Explanation
After the round is fired and the recoil causes the barrel and slide to move rearward, the next cycle of operation is unlocking. This refers to the process of disengaging the barrel and slide, allowing the slide to continue moving rearward while the barrel remains stationary. This unlocks the barrel from the slide, preparing the pistol for extraction of the spent casing and subsequent ejection.

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• 16.

### Which cycle of operation of the M9 pistol occurs as the slide moves forward and a round is stripped from the top of the magazine?

• A.

Firing

• B.

Locking

• C.

Feeding

• D.

Unlocking

C. Feeding
Explanation
During the cycle of operation of the M9 pistol, the feeding stage occurs as the slide moves forward and a round is stripped from the top of the magazine. This means that the slide is bringing the next round into position to be chambered and fired. This stage is crucial for the pistol to function properly and for the shooter to be able to fire subsequent rounds.

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• 17.

### Which is not a type of ammunition used in the M9 pistol?

• A.

MK243 Mod 0

• B.

M821 Ball

• C.

M917 dummy

• D.

9mm Frangible

B. M821 Ball
Explanation
The M821 Ball is not a type of ammunition used in the M9 pistol. The M9 pistol is typically chambered for 9mm ammunition, and the other options listed are all types of 9mm ammunition that can be used in the M9. However, the M821 Ball is not a recognized type of 9mm ammunition and therefore is not used in the M9 pistol.

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• 18.

### Personnel may use hollow point ammo where not prohibited by Geneva Convention, status of Forces agreement or

• A.

UCMJ

• B.

Manuals for courts martial

• C.

Host nation requirements

• D.

Federal law

C. Host nation requirements
Explanation
The correct answer is "Host nation requirements." This means that personnel may use hollow point ammo if it is allowed by the requirements of the host nation. This could include any regulations or laws set forth by the country in which the personnel are operating. It is important to adhere to these requirements to ensure compliance with the laws of the host nation.

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• 19.

### On a shotgun, the serial number is located on the

• A.

Stock

• B.

Barrel

• C.

Magazine

• D.

Explanation
The serial number on a shotgun is located on the receiver. The receiver is the main part of the firearm that houses the firing mechanism and connects the barrel, stock, and other components. It is typically made of metal and is where the serial number is engraved or stamped. This is done for identification and tracking purposes, as the receiver is considered the controlled part of the firearm. The stock, barrel, and magazine may also have their own markings or identification numbers, but the serial number is specifically located on the receiver.

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• 20.

### Which step in the M870 shotgun cycle of operation occurs as the shooter pushes the fore-end towards the front of the weapon?

• A.

Unlocking

• B.

Cocking

• C.

• D.

Feeding

Explanation
Loading is the step in the M870 shotgun cycle of operation that occurs as the shooter pushes the fore-end towards the front of the weapon. This action allows the shooter to load a new round into the chamber, preparing the shotgun for the next shot.

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• 21.

### What is the difference between the Mossberg 12-gauge models 500 and 590 shotgun?

• A.

Mossberg 590 has an extended barrel

• B.

Mossberg 500 has an extended barrel

• C.

Mossberg 590 has a detachable heat shield

• D.

Mossber 500 has a detachable heat shield

C. Mossberg 590 has a detachable heat shield
Explanation
The Mossberg 590 shotgun is different from the Mossberg 500 because it has a detachable heat shield. This feature allows the shooter to quickly remove the heat shield if desired. The Mossberg 500, on the other hand, does not have a detachable heat shield. This difference in the heat shield feature sets the two models apart from each other.

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• 22.

### What type of choke does the Mossberg 12 Gauge model 590 shotgun have?

• A.

Automatic

• B.

Cylinder

• C.

Manual

• D.

Cyclic

B. Cylinder
Explanation
The Mossberg 12 Gauge model 590 shotgun has a cylinder choke. A cylinder choke is a type of choke that has no constriction, meaning it does not narrow or constrict the shot pattern. This type of choke is ideal for close range shooting, as it allows for a wide and even spread of shot.

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• 23.

### Which 12 gauge shotgun cartridge contains a pyrotechnic projectile in a corrugated plastic case with brass plated steel base?

• A.

Dummy

• B.

Nonlethal

• C.

Bird scare cartridge

• D.

Breaching cartridge

C. Bird scare cartridge
Explanation
A bird scare cartridge is a 12 gauge shotgun cartridge that contains a pyrotechnic projectile. This projectile is housed in a corrugated plastic case with a brass plated steel base. Bird scare cartridges are commonly used to scare birds away from crops or other areas where they may cause damage. The pyrotechnic projectile creates a loud noise and bright flash upon impact, effectively frightening the birds and causing them to disperse.

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• 24.

### This 12 gauge breaching cartridge is used to gain access through

• A.

Entry ways and light armored vehicles

• B.

Entry ways and steel reinforced doors

• C.

Metal doors and entry ways

• D.

Light doors and entry ways

D. Light doors and entry ways
Explanation
This 12 gauge breaching cartridge is specifically designed to gain access through light doors and entry ways. It may not be powerful enough to breach steel reinforced doors or heavy armored vehicles, but it is suitable for lighter materials commonly found in entry ways.

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• 25.

### What is the minimum safe distance for training for the M203 grenade launcher?

• A.

400 meters

• B.

275 meters

• C.

165 meters

• D.

150 meters

C. 165 meters
Explanation
The minimum safe distance for training with the M203 grenade launcher is 165 meters. This distance ensures that the trainees are at a safe distance from the launcher when it is fired, reducing the risk of injury or damage. Being too close to the launcher can result in the trainees being exposed to the blast, shrapnel, or other hazards associated with the grenade launcher. Therefore, it is crucial to maintain a minimum safe distance of 165 meters during training with the M203 grenade launcher.

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• 26.

### The barrel assembly of the M203 is chambered for which type of 40mm grenade laucher ammo?

• A.

Low velocity

• B.

High velocity

• C.

Low explosive

• D.

High explosive

A. Low velocity
Explanation
The M203 barrel assembly is specifically designed to chamber and launch low velocity 40mm grenade launcher ammunition. This type of ammunition is used for shorter range engagements and is typically employed for close quarters combat or when firing from within a confined space. The low velocity ammunition allows for better control and accuracy in these situations, making it the appropriate choice for the M203 barrel assembly.

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• 27.

### When the barrel latch of the M203 grenade launcher is depressed, it unlocks the barrel so it can move forward along the

• A.

Slide assembly

• B.

Barrel assembly

• C.

• D.

Lower rail assembly

Explanation
The barrel latch of the M203 grenade launcher is responsible for unlocking the barrel, allowing it to move forward. This movement is facilitated by the receiver assembly, which houses the barrel and provides the necessary support and guidance for its movement. The receiver assembly is an integral part of the M203 grenade launcher and is responsible for ensuring the proper functioning and operation of the barrel.

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• 28.

### In which Air Force Technical Order (AFTO) will you find the PMCS procedures for the M203?

• A.

11W2-9-4-1

• B.

11W3-9-4-2

• C.

11W2-9-4-3

• D.

11W3-9-4-4

B. 11W3-9-4-2
Explanation
The correct answer is 11W3-9-4-2. This AFTO contains the PMCS (Preventive Maintenance Checks and Services) procedures for the M203.

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• 29.

### Cracks found on the M203 handguard assembly during preventive maintenance checks and service (PMCS) that would render it not fully capable are cracks exceeding

• A.

4 inches

• B.

3 inches

• C.

2 inches

• D.

1 inch

D. 1 inch
Explanation
The correct answer is 1 inch. This means that if cracks found on the M203 handguard assembly during preventive maintenance checks and service (PMCS) exceed 1 inch in length, it would render the assembly not fully capable. Cracks exceeding this length may compromise the structural integrity and functionality of the handguard assembly, potentially affecting its performance and reliability.

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• 30.

### Which tool is used to detect detents and minor damage in the M203 that would interfere with forward progress of fired projectile?

• A.

Bore detent detection tool

• B.

Bore projectile witdth tool

• C.

Bore constriction check tool

• D.

Bore width and projectile tool

C. Bore constriction check tool
Explanation
The Bore constriction check tool is used to detect detents and minor damage in the M203 that would interfere with forward progress of fired projectile.

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• 31.

### What is the correct sequence when performing the firing pin protrusion test on the M203 grenade launcher?

• A.

Cock, move the barrel forward, remove self-locking screw, squeeze the trigger

• B.

Squeeze the trigger, cock, move the barrel forward remove self-locking screw

• C.

Remove self-locking screw, cock, squeeze the trigger, move the barrel forward

• D.

Move the barrel forward, remove self-locking screw, cock, squeeze the trigger

A. Cock, move the barrel forward, remove self-locking screw, squeeze the trigger
Explanation
The correct sequence when performing the firing pin protrusion test on the M203 grenade launcher is to first cock the launcher, then move the barrel forward, followed by removing the self-locking screw, and finally squeezing the trigger. This sequence ensures that the firing pin protrusion is tested accurately and safely.

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• 32.

### Which of the eight steps in the cycle of operations for the M203 grenade launcher occur at the same time?

• A.

Extracting and ejecting

• B.

Extracting and cocking

• C.

Unlocking and cocking

• D.

B. Extracting and cocking
Explanation
In the cycle of operations for the M203 grenade launcher, the steps of extracting and cocking occur at the same time. Extracting refers to the process of removing the spent cartridge case from the chamber, while cocking involves preparing the firing mechanism for the next round. These two steps happen simultaneously to ensure a smooth and efficient operation of the grenade launcher.

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• 33.

### What is the arming distance for the M651 tactical chemical smoke round?

• A.

10-30 ft

• B.

10-30 meters

• C.

20-140 feet

• D.

20-40 meters

B. 10-30 meters
Explanation
The arming distance for the M651 tactical chemical smoke round is 10-30 meters. This means that the round needs to travel a minimum distance of 10 meters before it can be considered armed and ready to produce smoke. The maximum distance for arming is 30 meters, beyond which the round may not function as intended. This range ensures that the round is at a safe distance from the user when it activates, while still being effective in producing smoke for tactical purposes.

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• 34.

### Which M203 grenade launcher rounds is designed to inflict personal casualties using an air-burst effect?

• A.

M406, HE round

• B.

M433 HEDP

• C.

M651 tactical chemical smoke grenade

• D.

M397 HE Jump up fragmentation

D. M397 HE Jump up fragmentation
Explanation
The M397 HE Jump up fragmentation round is designed to inflict personal casualties using an air-burst effect. This means that when the round is fired, it explodes in the air above the target, causing fragmentation to rain down and potentially harm or kill individuals in the vicinity. This type of round is often used in military operations to engage enemy personnel and disrupt their movements.

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• 35.

### The candle burn on a M583A1 white star parachute round is about

• A.

40 seconds

• B.

30 seconds

• C.

20 seconds

• D.

10 seconds

A. 40 seconds
Explanation
The correct answer is 40 seconds. This suggests that the candle burn on a M583A1 white star parachute round lasts for approximately 40 seconds.

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• 36.

### What type of headspace does the M249 AR have?

• A.

Split

• B.

Fixed

• C.

Gapped

• D.

B. Fixed
Explanation
The M249 AR has a fixed type of headspace. This means that the distance between the face of the bolt and the base of the cartridge is predetermined and cannot be adjusted. This fixed headspace ensures consistent and reliable ignition of the cartridge, contributing to the overall reliability and accuracy of the firearm.

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• 37.

### This part of the M249 AR moves on a guide rail fixed to the right side of the receiver and pulls moving parts rearward

• A.

Slide assembly

• B.

Piston assembly

• C.

• D.

Cocking handle assemble

D. Cocking handle assemble
Explanation
The correct answer is "cocking handle assembly". The explanation is that the cocking handle assembly is the part of the M249 AR that moves on a guide rail fixed to the right side of the receiver and pulls moving parts rearward. This action allows for the chambering of a new round and prepares the weapon for firing.

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• 38.

### Incorrectly positioning the first round of a partial belt on the M249 AR feed tray can cause which malfunction?

• A.

Failure to fire

• B.

Sluggish operation

• C.

Failure to chamber

• D.

Failure to feed/strip

D. Failure to feed/strip
Explanation
Incorrectly positioning the first round of a partial belt on the M249 AR feed tray can cause a failure to feed/strip malfunction. This means that the weapon will not properly feed or strip the next round from the belt, resulting in a failure to fire. This can lead to sluggish operation and a failure to chamber the next round, ultimately impacting the overall functionality of the weapon.

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• 39.

### When using the M249 AR the failure to chamber malfunction is characterized by

• A.

A round of ammo not fully seated in the barrel

• B.

A spent cartridge located at the bottom of the receiver

• C.

More than one broken strand in the drive spring

• D.

A kinked, damaged or broken drive spring

A. A round of ammo not fully seated in the barrel
Explanation
The correct answer is a round of ammo not fully seated in the barrel. This means that the bullet has not been properly loaded into the chamber of the barrel, causing a malfunction. This can happen if the round is not inserted correctly or if there is an issue with the feeding mechanism. It is important to ensure that each round is properly seated in the barrel to prevent malfunctions and ensure the firearm functions correctly.

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• 40.

### When does extracting begin during the M249 AR cycle of operations?

• A.

During cocking

• B.

During unlocking

• C.

During feeding

• D.

During chambering

B. During unlocking
Explanation
During the M249 AR cycle of operations, extracting begins during unlocking. This refers to the phase when the bolt carrier group moves to the rear, unlocking the bolt from the barrel extension. As the bolt moves back, it extracts the spent casing from the chamber and prepares for the ejection process. This is a crucial step in the firing sequence as it ensures the removal of the fired round before the next round is chambered and fired.

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• 41.

### This M249 round of ammo contains no propellant or primer

• A.

M232 Dummy

• B.

M196 Tracer

• C.

M200 Blank

• D.

M193 Ball

A. M232 Dummy
Explanation
The M232 Dummy round of ammo is the correct answer because it is specifically designed to simulate the weight and dimensions of live ammunition, but it does not contain any propellant or primer. This makes it safe for training and practice purposes, as it does not produce a projectile or any explosive force when fired.

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• 42.

### This M249 round of ammo is distinguished by its seven petal rosette crimp and violet tip?

• A.

M232 Dummy

• B.

M196 Tracer

• C.

M200 Blank

• D.

M193 Ball

C. M200 Blank
Explanation
The correct answer is M200 Blank. The M249 round of ammo is distinguished by its seven petal rosette crimp and violet tip, which matches the characteristics of the M200 Blank ammunition. The other options, M232 Dummy, M196 Tracer, and M193 Ball, do not have the same crimp or tip color, making them incorrect choices.

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• 43.

### M240B machine gun ammunition feeds from a bandoleer that holds how many rounds of ammunition

• A.

50

• B.

100

• C.

150

• D.

200

B. 100
Explanation
The M240B machine gun ammunition feeds from a bandoleer that holds 100 rounds of ammunition. This means that the bandoleer is designed to carry and supply the gun with 100 rounds of ammunition, ensuring that the gunner has an adequate amount of ammunition readily available for use.

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• 44.

### What is the maximum range for the M240B machine gun?

• A.

3725 meters

• B.

1800 meters

• C.

1200 meters

• D.

800 meters

A. 3725 meters
Explanation
The maximum range for the M240B machine gun is 3725 meters.

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• 45.

### Which M240B machine gun assembly provides feeding, stripping, chambering, firing, extraction, and ejection of cartridges using the projectile propelling gas for power?

• A.

Barrel assembly

• B.

Driving spring rod assembly

• C.

Bolt and operation rod assembly

• D.

Feed tray and receiver assembly

C. Bolt and operation rod assembly
Explanation
The bolt and operation rod assembly is responsible for providing feeding, stripping, chambering, firing, extraction, and ejection of cartridges in the M240B machine gun. This assembly uses the projectile propelling gas for power to perform these functions.

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• 46.

### Which would be a primary cause for a failure to feed in the M240B machine gun?

• A.

Broken sear

• B.

Broken firing pin

• C.

Damaged extractor

• D.

Insufficient gas pressure

D. Insufficient gas pressure
Explanation
Insufficient gas pressure can be a primary cause for a failure to feed in the M240B machine gun. This is because the gun relies on gas pressure to cycle the action, which in turn feeds the next round into the chamber. If there is not enough gas pressure, the action may not cycle properly, resulting in a failure to feed. This can occur due to various reasons such as a malfunctioning gas system, a clogged gas port, or insufficient gas being generated by the ammunition.

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• 47.

### When inspecting the barrel assembly of the M240B machine gun, check for bulges, bends, burrs, obstructions or pits in the

• A.

Breech assembly

• B.

Chamber or bore

• C.

Feed tray

• D.

Plug

B. Chamber or bore
Explanation
When inspecting the barrel assembly of the M240B machine gun, it is important to check for any bulges, bends, burrs, obstructions, or pits in the chamber or bore. The chamber is where the cartridge is loaded and fired, so any issues with it can affect the gun's performance and safety. The bore refers to the inside of the barrel, and any irregularities in it can impact the accuracy and effectiveness of the weapon. Therefore, it is crucial to thoroughly examine these areas to ensure the proper functioning of the M240B machine gun.

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• 48.

### Which gauge is used to inspect the M240B machine gun for barrel erosion

• A.

Barrel wear gauge

• B.

Pre-embarkation gauge

• C.

Muzzle and breech bore wear gauge

• D.

Chamber and barrel assembly gauge

C. Muzzle and breech bore wear gauge
Explanation
The M240B machine gun is inspected for barrel erosion using the muzzle and breech bore wear gauge. This gauge is specifically designed to measure the wear and tear on the muzzle and breech bore of the gun's barrel. By using this gauge, the inspector can determine if there is any erosion or damage to these critical parts of the barrel, which can affect the gun's performance and accuracy.

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• 49.

### During the feeding cycle of operation for the M240B machine gun, the actuating rollers move the feed lever side to side, which in turn does what?

• A.

• B.

Releases the sear

• C.

Moves the feed pawls

• D.

Stripes a round from the belt

C. Moves the feed pawls
Explanation
During the feeding cycle of operation for the M240B machine gun, the actuating rollers move the feed lever side to side. This movement of the feed lever causes the feed pawls to also move. The feed pawls are responsible for stripping a round from the belt of ammunition and positioning it correctly for loading into the weapon's chamber. Therefore, the correct answer is that the actuating rollers moving the feed lever side to side moves the feed pawls.

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• 50.

### Which of these M240B machine gun rounds is used for the training in local and urban training areas where range restrictions preclude the use of full range standard service ammo?

• A.

M993 Armor Piercing

• B.

M973 Short Range training Ammo

• C.

M974 Short Range Target Ammo

• D.

M90 Ball

B. M973 Short Range training Ammo
Explanation
The M973 Short Range training Ammo is used for training in local and urban areas where range restrictions prevent the use of full range standard service ammo. This suggests that the M973 round is specifically designed for shorter range training purposes and is likely to have reduced range capabilities compared to other rounds.

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• Current Version
• Mar 20, 2023
Quiz Edited by
ProProfs Editorial Team
• Aug 21, 2016
Quiz Created by
Don

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