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M240 Flashcards

1
Q

M240 General Characteristics

A

Air-cooled, belt-fed, gas-operated, automatic weapon. it fires from the OPEN-BOLT POSITION

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2
Q

M240 Weight

A

27 LBS

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3
Q

M240 Maximum Range

A

3,725 Meters

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4
Q

Max Effective Range

Point Target

A

Tripod - 800 Meters

Bipod - 600 Meters

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5
Q

Max Effective Range

Area Target

A

Tripod - 1,800 Meters

800 Meters

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6
Q

Muzzle Velocity

A

2,800 fps

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7
Q

M240 Barrel Characteristics

A

1/12 right-hand twist

All M240 barrels have an established head space, 2-7 clicks

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8
Q

M240 Sights

A
  • Rear, fully adjustable peep-type sight for elevation and windage
  • Front Post Sight
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9
Q

M240 Battle Sight Zero

A

12.7 Meters for 500 Meter Zero

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10
Q

M240 Cyclic Rate

A

600-950 round per minute (regulator and buffer dependent)

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11
Q

M240 Weapon Employment

A 
May be used effectively against;
Personnel,
Light Armored Vehicles,
Small waterborne Craft,
Aircraft,
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12
Q

M240 Operators Manual

A

SW360-AH-OPI-010

General Information,

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13
Q

M240 Tech Manual

A

SW360-AH-OMP-010

Everything in Operator Manual (More Detailed)

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14
Q

M240 Mount Manual

A

SW360-AQ-MMO-010

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15
Q

All Weapon Log Book

A

SW360-AA-MMO-010
Firing record for guns and barrels
NEED (x3) Books for the M240

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16
Q

Marine Corps War-fighting Publication

A

MCWP 3-15.1
Machine Guns and Machine Gun Gunnery;
M249, M240, M2HB, and MK19,
CSW Employment and Gunnery

17
Q

Clearing Live Ammunition From Guns Manual

A

SW300-BC-SAF-010, Rev 2

18
Q

Force Protection Weapons Handling Standard Procedures and Guidelines Manual

A

NRTP 3-07.2.2

19
Q

M240 Five Major Assemblies;

A
  1. ) Bolt and Operation Rod Assembly,
  2. ) Barrel Assembly,
  3. ) Buttstock and buffer Assembly,
  4. ) Receiver Assembly,
  5. ) Trigger Housing Assembly,
20
Q

M240, What are the three Gas Regulator Settings for;

A
  1. ) For Normal Operation,
  2. ) Used for Firing Blanks,
  3. ) Use when experiencing Sluggish Operation due to Environmental Conditions.
21
Q

M240, CHAMBERING Cycle of Operation

A

When the trigger is pulled, the sear is lowered releasing the bolt and operating rod assembly. As the driving spring rod assembly pushes the operating rod forward the bolt feed horn strikes the base of the round in feed tray groove and strips the round from the belt link. The pressure of the cartridge guides holds the round so that positive contact is made with the top of the bolt. The front cartridge guide also prevents forward movement of the link as the round is stripped from the belt. The chambering ramp angles the round downward and into the chamber. When the round is fully seated in the chamber, the extractor snaps over the rim of the cartridge, and the ejector is compressed.

22
Q

M240, LOCKING Cycle of Operation

A

As the round is being chambered, the bolt and operating rod assembly continue forward. The receiver locking cams force the bolt locking lever down. The operating rod continues to move forward, causing the locking lever link to rotate downward and back. This forces the locking lever arms down to their fullest extent in front of the bolt locking rails. Locking is now complete.

23
Q

M240, FIRING Cycle of Operation

A

The round is now fully seated with the breech locked. The final forward movement of the operating rod drives the firing pin through the bolt assembly onto the cartridge primer and fires the round. The working parts are now fully forward.

24
Q

M240, UNLOCKING Cycle of Operation

A

After the round is fired and the projectile passes the gas port, some of the expanding gases pass through the gas port through the gas regulator into the gas cylinder. The rapidly expanding gases enter the hollow end cup of the gas piston and force the operating rod assembly to the rear. At this point, the locking lever link begins to swing toward the rear, lifting locking levers over bolt locking rails carrying the bolt with it into its unlocked position, and clearing the barrel breech.

25
Q

M240, EXTRACTING Cycle of Operation

A

When the breech is fully unlocked and the bolt and operating rod assembly begin its rearward movement, the extractor withdraws the empty cartridge case from the chamber.

26
Q

M240, EJECTING Cycle of Operation

A

As the cartridge case is withdrawn from the chamber, the ejector pushes on the top, and the extractor pulls from the bottom rim. The casing falls down from the face of the bolt as soon as it reaches the cartridge-ejection port. The empty belt links are forced out the link ejection port as the rearward movement of the bolt causes the next round to be positioned in the tray groove.

27
Q

M240, FEEDING Cycle of Operation

A

When the linear cam is engaged in the track on the feed lever, the cam will cause the feed lever to move left and right as the bolt moves front and rear.
A two stage feed mechanism, where the feed pawl assembly consists of two separate pawl sets allowing the feed lever to partially feed with each direction of the bolt movement.
As the bolt starts its forward movement, the feed lever is forced to the right, causing the feed pawl assembly to move to the left. This forces the feed pawl assembly over the next round in the belt. After firing, as the bolt moves to the rear, the linear cam roller forces the feed lever to the left. The feed lever is forced to turn, moving the feed pawl to the right, which places a round in the feed tray groove.

28
Q

M240, COCKING Cycle of Operation

A

(1) As long as the trigger is held to the rear, the weapon will continue to fire. When the trigger is released, the sear remains down, but the tripping lever rises. As the operating rod assembly comes to the rear, the end of the operating rod hits the tripping lever, which, in turn, allows the sear to rise and engage the sear notch, which holds the bolt and operating assemble to the rear. At this point the weapon is cocked and all the parts of the weapon are placed in position to fire the next round.
(2) In auto all moving parts are at the rear most position ready to start cycle of operations over.
(3) If the bolt is pulled to the rear far enough for the feed horns to chamber a round.

29
Q

Condition-4, Condition Codes

A

No Ammunition Present, Chamber Empty, Bolt Forward, Safety on FIRE, Cover Closed.

30
Q

Condition-3, Condition Codes

A

Chamber Empty, Safety on FIRE, Bolt Forward, Ammunition on the Feed Tray, Cover Closed.

31
Q

Condition-1, Condition Codes

A

Ammunition on Feed Tray, Chamber Empty, Bolt to the Rear, Safety on SAFE, Cover Closed.

32
Q

CSSLSC

A
  1. ) Cock it,
  2. ) Shove it,
  3. ) Safe it,
  4. ) Lift it,
  5. ) Sweep it,
  6. ) Check it.
33
Q

M240 Cold Gun

A

LESS THAN 200 Rounds fired within a two minute period

34
Q

M240 Hot Gun

A

200 rounds or MORE fired within a two minute period

35
Q

M240 Max Ordinate

36
Q

M240 Predecessor

CSWI O&M (6 decks)

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