M240B Specifications Quiz
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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?

<p>14.8 lbs</p> Signup and view all the answers

What is the length of the gun?

<p>49 inches</p> Signup and view all the answers

What is the height of the gun on a tripod?

<p>17.5 inches</p> Signup and view all the answers

What is the length of the barrel?

<p>23.6 inches</p> Signup and view all the answers

What is the maximum range of the M240B?

<p>3725 m</p> Signup and view all the answers

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

<p>1800 m</p> Signup and view all the answers

What is the distance for grazing fire?

<p>600 m</p> Signup and view all the answers

What is the distance for tracer burnout?

<p>900 m</p> Signup and view all the answers

What type of rifling does the M240B use?

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

What is the muzzle velocity of the M240B?

<p>2800 fps</p> Signup and view all the answers

What is the sustained rate of fire for the M240B?

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

What is the rapid rate of fire for the M240B?

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

What is the cyclic rate of fire for the M240B?

<p>600-650 RDS/M continuous burst, barrel change every one min</p> 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 ___.

<p>feed tray</p> Signup and view all the answers

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

<p>Firing, unlocking, extracting, ejecting, cocking, feeding, locking, firing</p> Signup and view all the answers

What is Condition 4 for the M240B?

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

What is Condition 3 for the M240B?

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

What is Condition 2 for the M240B?

<p>Doesn't apply</p> Signup and view all the answers

What is Condition 1 for the M240B?

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

What are the lubricants used for the M240B?

<p>CLP, LSA, LSA-T, LAW</p> Signup and view all the answers

What are the M122 Tripod mil measurements?

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

What is the M122 tripod elevation and depression range?

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

What are the elevating hand wheel measurements for the M240B?

<p>1 mil increments, 0 to 50</p> Signup and view all the answers

What are the dimensions of the M35 MMGVM?

<p>12.5&quot; x 17.0&quot; x 8.0&quot;</p> Signup and view all the answers

What is the weight of the Mk35 MMGVM?

<p>12.5 lbs</p> Signup and view all the answers

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

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

What is a stoppage in relation to the M240B?

<p>Any interruption in the cycle of operations</p> Signup and view all the answers

What is a malfunction in the context of the M240B?

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

What causes sluggish operation in the M240B?

<p>Excessive friction or loss of gas</p> Signup and view all the answers

What is a runaway gun?

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

What is a hang fire?

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

What is a cookoff?

<p>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</p> Signup and view all the answers

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

<p>200 rounds</p> Signup and view all the answers

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

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

What is remedial action for the M240B?

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

What does MDO stand for?

<p>Medium Machine Gun Day Optic</p> Signup and view all the answers

What is the objective lens size of the MDO?

<p>48 mm</p> Signup and view all the answers

What is the magnification of the MDO?

<p>6x</p> Signup and view all the answers

What is the eye relief of the MDO?

<p>2.7 inches</p> Signup and view all the answers

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

<p>3.3 degrees/17 ft</p> Signup and view all the answers

What is the adjustment increment for the MDO?

<p>1 click = 1 Mil</p> Signup and view all the answers

What is the weight of the MDO?

<p>2.8 lbs</p> Signup and view all the answers

Flashcards

M240B Total Weight

27.1 lbs

M240B Barrel Weight

6.6 lbs

M240B Overall Length

49 inches

M240B Barrel Length

23.6 inches

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M240B Maximum Range

3725 meters

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M240B Max Effective Range (Tripod)

1800 meters

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M240B Grazing Fire

600 meters

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M240B Tracer Burnout

900 meters

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M240B Rifling

Four grooves, right-hand twist, one turn in 12 inches

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M240B Muzzle Velocity

2800 fps

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M240B Sustained Firing Rate

100 rounds/minute

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M240B Rapid Firing Rate

200 rounds/minute

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M240B Cyclic Firing Rate

600-650 rounds/minute

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M240B Main Assemblies

Buttstock and buffer, bolt operating rod assembly, driving spring rod assembly, trigger housing assembly, receiver, barrel assembly, cover assembly, feed tray

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M240B Cycle of Operations

Firing, unlocking, extracting, ejecting, cocking, feeding, locking, and firing

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M240B Condition 4

Bolt forward, chamber empty, no rounds in feed tray, weapon on 'fire', cover closed.

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M240B Condition 3

Bolt forward, chamber empty, rounds in feed tray, weapon on 'fire', cover closed.

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M240B Condition 1

Bolt locked to the rear, chamber empty, rounds in feed tray, cover closed, weapon on safe.

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M240B Lubricants

CLP, LSA, LSA-T, LAW

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M122 Tripod Mil Measurements

5 mil increments, numbers every 100 mils from center, 6400 mils free gun.

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M122 Tripod Elevation/Depression

50 mil increments, total elevation change of 447 mils.

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M240B Round Types

Ball, blank, dummy, tracer, and armor-piercing rounds

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M240B Stoppage

Any interruption in the cycle of operations.

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M240B Malfunction

Failure for the gun to function satisfactorily, results in sluggish operation or runaway gun.

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M240B Runaway Gun

Continuously fires after trigger is released, often due to a bad sear.

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M240B Hang Fire

Delayed firing after the firing pin strikes the primer.

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M240B Cook-Off

Ignition of propellant due to barrel heat without primer strike.

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M240B Hot Barrel

200 rounds in 2 minutes; deemed hot after a long continuous burst over 15 minutes.

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M240B Immediate Action

Quick response by the gunner to clear a stoppage without investigating the cause.

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M240B Remedial Action

Inspection and correction of the problem, may involve disassembly and parts replacement.

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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

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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.

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