M240B Machine Gun Quiz: Effective Range & Specs

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the weight of the 240B?

27.1 lbs

What is the weight of the barrel?

6.6 lbs

What is the weight of the spare barrel case with spare barrel and SL3?

12.9 lbs

What is the weight of the tripod with T&E?

14.8 lbs Signup and view all the answers

What is the length of the gun?

49 inches Signup and view all the answers

What is the height of the gun on a tripod?

17.5 inches Signup and view all the answers

What is the length of the barrel?

23.6 inches Signup and view all the answers

What is the maximum range of the M240B?

3725 m Signup and view all the answers

What is the maximum effective range of the M240B with a tripod?

1800 m Signup and view all the answers

What is the distance for grazing fire?

600 m Signup and view all the answers

What is the distance for tracer burnout?

900 m Signup and view all the answers

What type of rifling does the M240B use?

Four grooves with a uniform right hand twist, one turn in 12 inches Signup and view all the answers

What is the muzzle velocity of the M240B?

2800 fps Signup and view all the answers

What is the sustained rate of fire for the M240B?

100 RDS/M, 4-5 sec pause, barrel change every 10 min Signup and view all the answers

What is the rapid rate of fire for the M240B?

200 RDS/M, 2-3 sec pause, barrel change every 2 min Signup and view all the answers

What is the cyclic rate of fire for the M240B?

600-650 RDS/M continuous burst, barrel change every one min Signup and view all the answers

The eight main assemblies of the M240B include: Buttstock and buffer, bolt operating rod assembly, driving spring rod assembly, trigger housing assembly, receiver, barrel assembly, cover assembly, and ___.

feed tray Signup and view all the answers

What are the steps in the cycle of operations for the M240B?

Firing, unlocking, extracting, ejecting, cocking, feeding, locking, firing Signup and view all the answers

What is Condition 4 for the M240B?

Bolt forward, chamber empty, no rounds on feed tray, weapon on fire, cover closed Signup and view all the answers

What is Condition 3 for the M240B?

Bolt forward, chamber empty, rounds on feed tray, weapon on fire, cover closed Signup and view all the answers

What is Condition 2 for the M240B?

Doesn't apply Signup and view all the answers

What is Condition 1 for the M240B?

Bolt locked to the rear, chamber empty, rounds on feed tray, cover closed, weapon on safe Signup and view all the answers

What are the lubricants used for the M240B?

CLP, LSA, LSA-T, LAW Signup and view all the answers

What are the M122 Tripod mil measurements?

5 mil increments, numbered every 100 mils from 0 in the center, 450 left of slide, 425 right of slide, 6400 mils free gun Signup and view all the answers

What is the M122 tripod elevation and depression range?

50 mil increments, 0 to +200 mils / 0 to -200 for a total of 447 mils of elevation change Signup and view all the answers

What are the elevating hand wheel measurements for the M240B?

1 mil increments, 0 to 50 Signup and view all the answers

What are the dimensions of the M35 MMGVM?

12.5" x 17.0" x 8.0" Signup and view all the answers

What is the weight of the Mk35 MMGVM?

12.5 lbs Signup and view all the answers

What types of rounds are used with the M240B? (Select all that apply)

Blank (A), Dummy (B), Ball (C), Armor Piercing (D), Tracer (E) Signup and view all the answers

What is a stoppage in relation to the M240B?

Any interruption in the cycle of operations Signup and view all the answers

What is a malfunction in the context of the M240B?

Failure for the gun to function satisfactorily, sluggish operation/runaway gun Signup and view all the answers

What causes sluggish operation in the M240B?

Excessive friction or loss of gas Signup and view all the answers

What is a runaway gun?

Gun continues to fire after the trigger has been released, caused by broken, worn, or burred sear Signup and view all the answers

What is a hang fire?

The round goes off sometime after the firing pin strikes the primer Signup and view all the answers

What is a cookoff?

Where the heat of the barrel is hot enough to ignite the propellant powder inside the round even though the primer has not been struck Signup and view all the answers

How many rounds in 2 minutes classify a barrel as hot?

200 rounds Signup and view all the answers

What is the definition of immediate action in relation to the M240B?

Prompt action taken by the gunner to reduce a stoppage of the gun without investigating the cause Signup and view all the answers

What is remedial action for the M240B?

Action taken to inspect, identify, and correct the problem with the weapon or ammunition, may include disassembly of the weapon and replacement of parts Signup and view all the answers

What does MDO stand for?

Medium Machine Gun Day Optic Signup and view all the answers

What is the objective lens size of the MDO?

48 mm Signup and view all the answers

What is the magnification of the MDO?

6x Signup and view all the answers

What is the eye relief of the MDO?

2.7 inches Signup and view all the answers

What is the field of view of the MDO at 100 m?

3.3 degrees/17 ft Signup and view all the answers

What is the adjustment increment for the MDO?

1 click = 1 Mil Signup and view all the answers

What is the weight of the MDO?

2.8 lbs Signup and view all the answers

Study Notes

M240B Specifications

Total weight: 27.1 lbs
Barrel weight: 6.6 lbs
Weight of spare barrel case (with barrel and SL3): 12.9 lbs
Tripod weight (with T&E): 14.8 lbs
Overall length of the gun: 49 inches
Height on tripod: 17.5 inches
Length of barrel: 23.6 inches

Range Capabilities

Maximum range: 3725 meters
Maximum effective range with tripod: 1800 meters
Grazing fire effective to: 600 meters
Tracer burnout distance: 900 meters

Ammunition and Operation

Rifling characteristics: Four grooves with a right-hand twist, one turn in 12 inches
Muzzle velocity: 2800 fps
Sustained firing rate: 100 rounds/minute with a 4-5 second pause, barrel change every 10 minutes
Rapid firing rate: 200 rounds/minute with a 2-3 second pause, barrel change every 2 minutes
Cyclic firing rate: 600-650 rounds/minute, continuous burst with barrel change every minute

Main Components

Eight main assemblies include: Buttstock and buffer, bolt operating rod assembly, driving spring rod assembly, trigger housing assembly, receiver, barrel assembly, cover assembly, and feed tray.

Cycle of Operations

Sequence involves firing, unlocking, extracting, ejecting, cocking, feeding, locking, and firing.

Weapon Conditions

Condition 4: Bolt forward, chamber empty, no rounds in feed tray, weapon on fire, cover closed.
Condition 3: Bolt forward, chamber empty, rounds in feed tray, weapon on fire, cover closed.
Condition 2: Not applicable.
Condition 1: Bolt locked to the rear, chamber empty, rounds in feed tray, cover closed, weapon on safe.

Lubricants

Types include CLP, LSA, LSA-T, LAW.

M122 Tripod Specifications

Mil measurements: 5 mil increments, numbers every 100 mils from center, 6400 mils free gun.
Elevation and depression: 50 mil increments, total elevation change of 447 mils.
Elevating hand wheel adjustments: 1 mil increments from 0 to 50.

MMGVM Information

Dimensions of M35 MMGVM: 12.5" x 17.0" x 8.0"
Weight of Mk35 MMGVM: 12.5 lbs

Round Types

Categories include ball, blank, dummy, tracer, and armor-piercing rounds.

Malfunctions and Stoppages

Stoppage: Any interruption in the cycle of operations.
Malfunction: Failure for the gun to function satisfactorily, results in sluggish operation or runaway gun.
Sluggish operation: Caused by excessive friction or loss of gas.
Runaway gun: Continuously fires after trigger is released, often due to a bad sear.
Hang fire: Delayed firing after the firing pin strikes the primer.
Cook-off: Ignition of propellant due to barrel heat without primer strike.

Hot Barrel Considerations

Definition of hot barrel: 200 rounds in 2 minutes; deemed hot after a long continuous burst over 15 minutes, as determined by squad leader or vehicle commander.

Actions for Stoppages

Immediate action: Quick response by the gunner to clear a stoppage without investigating the cause.
Remedial action: Inspection and correction of the problem, may involve disassembly and parts replacement.

MDO Specifications

Medium Machine Gun Day Optic (MDO) features:
- Objective lens size: 48 mm
- Magnification: 6x
- Eye relief: 2.7 inches
- Field of view: 3.3 degrees (17 ft at 100 m)
- Adjustment: 1 click equals 1 mil
- Weight: 2.8 lbs

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Description

Test your knowledge on the specifications of the M240B machine gun. This quiz covers various details including weights and dimensions that are crucial for understanding the weapon's features. Perfect for military personnel and firearms enthusiasts.

M240B Specifications Quiz

Choose a study mode