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?
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What is the length of the gun?
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What is the height of the gun on a tripod?
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What is the length of the barrel?
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What is the maximum range of the M240B?
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What is the maximum effective range of the M240B with a tripod?
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What is the distance for grazing fire?
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What is the distance for tracer burnout?
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What type of rifling does the M240B use?
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What is the muzzle velocity of the M240B?
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What is the sustained rate of fire for the M240B?
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What is the rapid rate of fire for the M240B?
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What is the cyclic rate of fire for the M240B?
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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 ___.
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What are the steps in the cycle of operations for the M240B?
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What is Condition 4 for the M240B?
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What is Condition 3 for the M240B?
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What is Condition 2 for the M240B?
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What is Condition 1 for the M240B?
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What are the lubricants used for the M240B?
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What are the M122 Tripod mil measurements?
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What is the M122 tripod elevation and depression range?
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What are the elevating hand wheel measurements for the M240B?
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What are the dimensions of the M35 MMGVM?
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What is the weight of the Mk35 MMGVM?
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What types of rounds are used with the M240B? (Select all that apply)
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What is a stoppage in relation to the M240B?
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What is a malfunction in the context of the M240B?
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What causes sluggish operation in the M240B?
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What is a runaway gun?
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What is a hang fire?
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What is a cookoff?
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How many rounds in 2 minutes classify a barrel as hot?
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What is the definition of immediate action in relation to the M240B?
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What is remedial action for the M240B?
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What does MDO stand for?
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What is the objective lens size of the MDO?
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What is the magnification of the MDO?
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What is the eye relief of the MDO?
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What is the field of view of the MDO at 100 m?
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What is the adjustment increment for the MDO?
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What is the weight of the MDO?
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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.