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Flashcards in Basic Operations Deck (36)
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1

What are the 8 cycles of Operation?

Feeding
Chambering
Locking
Firing
Unlocking
Extracting
Ejecting
Cocking

2

Three types of magazines

Box (Staggered and inline)
Drum
Pan

3

Three types of feeding mechanisms

Magazines
Belts
Clips

4

Four types of belts...

SLD
SLND
FED
FEND

5

Two types of clips

En-bloc Clip
Stripper Clip

6

Five types of Cartridges

Rimmed
Semi-rimmed
Rimless
Belted
Rebated

7

What are the five types of Firing pins?

Free floating
Inertia
Percussion
Striker
Fixed

8

What are the three ways pins receive energy?

A larger mass strikes them
A spring provides energy
Their own mass provides energy

9

Two types of primers

Boxer
Berdan

10

What are the eight locking systems?

Rotating Bolt
Rising/Lowering Bolt
Roller
Rising Barrel
Locking Flaps
Swinging Bolt
Locking Block
Rotating Barrel

11

What are the eight operating systems?

Bolt Action
Blowback
Delayed Blowback
Recoil
Recoil with Gas Assist
Gas Operation
Manual Pump
Revolving Cylinder

12

What are the three types of gas operation?

Gas Blast
Gas Tappet
Gas Direct

13

What is a Disconnector?

A device incorporated into the action of a weapon which prevents the firing of more than on shot for one pull of the Trigger, or which prevents the weapon from being fired until the action is fully closed.

14

What does a compensator do?

Deflects gases upward in order to retard muzzle climb.

15

What does a flash suppressor do?

Cools the hot gases as the round leaves the muzzle, which reduces the flash.

16

What are grooves?

The portion of the rifling in the barrel that works in conjunction with the lands to impart spinning motion on a bullet.

17

What is a hangfire?

A delay in the ignition of the powder charge, unpredictable and dangerous.

18

What is a 'Hold Open Device'?

A component in a weapon designed to hold the bolt to the rear when it is out of ammunition.

19

What is a muzzle brake?

A device on the muzzle that deflects gases and pulls the weapon forward to offset some of the recoil.

20

What is muzzle velocity?

Velocity in Feet Per Second at which the bullet leaves the barrel.

21

What is pitch?

The angle at which the rifling is cut in relation to the axis of the borrow. Expressed as the length of the bore for one complete turn/spiral.

22

What is a sear?

A component retained under spring tension that releases, by means of a trigger, either a firing pin, hammer, or bolt.

23

What are the three rates of fire?

Sustained
Rapid
Cyclic

24

What is a breechblock?

A component that seals the breech and blocks gases from the fired cartridge.

25

What is the chamber?

The unrifled portion of the bore at the rear end of the barrel that receives and supports the cartridge when the breech is closed. It aligns the bullet with the bore and the primer with the firing pin.

26

What is an accelerator?

A device that operates during the rearward movement of the recoiling parts to increase the speed at which certain parts move.

27

What is headspace?

The distance from the breechblock to that part of the chamber which stops the forward movement of the cartridge case.

28

What are the two types of flash supressors?

Duckbill
Bird Cage

29

What leaves burn marks on spent cartridge casings?

A fluted chamber.

30

What is a fluted chamber used for?

Used to maximize energy for extraction. Commonly found in HKs