M240B Flashcards

0
Q

Weight of barrel…

A

6.6 pounds

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1
Q

Weight of machine gun…

A

27.1 pounds

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2
Q

Weitht of spare barrel case, complete w/ spare barrel and all SL-3 components….

A

12.9 pounds

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3
Q

Weight of tripod with T&E mechanism..

A

12.8 pounds

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4
Q

Length of machine gun…

A

49 inches

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5
Q

Height of machine gun on tripod….

A

17.5 inches

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6
Q

Maximum range…

A

3,725 meters

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7
Q

Maximum effective range (with the M122 tripod)

A

1,800 meters

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8
Q

Grazing fire

A

600 meters

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9
Q

Tracer burnout (approximate)

A

900 meters

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10
Q

Sustained rate of fire

A

100 RDS/M 6-8 rd burst (4-5 seconds pause between burst) -Change barrel every 10 minutes

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11
Q

Rapid rate of fire

A

200 RDS/M 10-12 rd burst (2-3 seconds pause between burst) -Change barrel every 2 minutes

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12
Q

Cyclic rate of fire

A

550 to 650 RDS/M continuous burst -Change barrel every 1 minute

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13
Q

Muzzle velocity

A

2,800 feet per second

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14
Q

Rifling

A

Four grooves with a uniform right hand twist, one turn in 12 inches

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15
Q

Condition 4

A

The bolt is forward, the safety is OFF and the feed tray is clear of ammunition. The chamber is empty and the cover is closed.

16
Q

Condition 3

A

The bolt is forward. The chamber is empty and the safety is OFF. The cover is closed. The source of ammunition is on the feed tray open link down.

17
Q

Condition 2

A

Does not apply to the M240B

18
Q

Condition 1

A

The bolt is locked to the rear. The safety is on. Rounds are positioned in the feed tray open link down first round in the feed tray groove. Cover is closed.

19
Q

Authorized Cleaning Materials

A

CLP, RBC, dry cleaning solvent, and hot soapy water.

20
Q

Authorized Lubricants

A

CLP, LSA, LSA-T, and LAW

21
Q

Immediate action

A

MISFIRE!!! (X3) 5,4,3,2,1 Pull the bolt to the rear observing for feeding and ejecting.

22
Q

Hang fire

A

A round that goes off some time after the firing pin strikes the primer due to a slow burning propellant

23
Q

Cook-off

A

When the heat of the barrel is high enough to cause the propellant powder inside the round to ignite even though the primer is not struck.