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Basic Operation Of Small Arms > BASIC OPERATION OF SMALL ARMS > Flashcards

BASIC OPERATION OF SMALL ARMS Flashcards

1
Q

Ballistics

A

The science and study of the motion and impact of projectiles.

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2
Q

Three types of ballistics

A

Internal Ballistics

External Ballistics

Terminal Ballistics

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3
Q

Battle Sight

A

The range that allows you to hit the target between the throat and waist without sight adjustment.

Exact range veries with caliber of weapon.

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4
Q

Breechblock

A

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

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5
Q

Caliber

A

The distance across the bore of a weapon, measured from land to land expressed in hundredths of an inch.

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6
Q

Compensator

A

A device attached to the muzzle of a weapon designed to allow gases to be deflected upward through slots in the top surface of the compensator. The lower portion is solid, so while some gases escape from the top, gas is also pressing against the bottom. The pressure against the bottom pushes the compensator down, keeping the muzzle down. This tends to retarded muzzle climb.

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7
Q

Disconnector

A

Prevents the firing of more than one shot for one pull of the trigger or which prevents the weapon from being fired until the action is fully closed.

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8
Q

Flash Suppressor

A

A three or four pronged device attached to the muzzle of a weapon designed to cool the hot gases as it leaves the muzzle behind the round, cooling the gases reduces the flash.

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9
Q

Headspace

A

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

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10
Q

Muzzle Brake

A

A device at the muzzle end of the weapon which deflects the emerging powder gases. The energy imparted by this act of deflection pulls the weapon forward to offset some of the rearward motion of recoil.

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11
Q

Sear

A

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

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12
Q

Types of Firing

A

Single Action (SA)

Double Action (DA)

Semi-Automatic (Semi-only)

Automatic (Auto-only)

Selective Fire (Sel.-fire)

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13
Q

Cycles of operation

A 
Feeding
Chambering
Locking
Firing
Unlocking
Extracting
Ejecting 
Cocking
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14
Q

Feeding mechanisms

A

Magazines
Belts
Clips

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15
Q

Type of magazines

A

Box(inline or staggered)
Drum
Pan

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16
Q

Type of belts

A

SLD MLB
SLND MLB
FED MLB
FEND MLB

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17
Q

Type of clips

A

En-bloc clip

Stripper clips

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18
Q

Five types of cartridges

A 
Rimmed cartridge
Semi-rimmed cartridge
Rimless cartridge
Belted cartridge
Rebated cartridge
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19
Q

5 varieties of firing pins

A 
Free-floating
Inertia
Percussion
Striker 
Fixed
20
Q

The three ways firing pins receive their energy

A
  1. A larger mass strikes them. (Free-floating)
  2. A spring provides the energy. ( Inertia, percussion, striker)
  3. Their own mass provides the energy. ( Fixed)
21
Q

Free-floating firing pin

A

Larger mass strikes the firing pin. Longer than its carrier; no spring is used on either forward or rearward movement of the firing pin.

22
Q

Inertia firing pin

A

Forward energy is created when the hammer strikes the firing pin. As the pin is driven forward by the strike of the hammer, the spring compresses creating the energy needed to reset the firing pin.

23
Q

Percussion firing pin

A

The firing pin is driven forward by the force of a compressed spring and is retracted by the cam action that cocks the weapon.

24
Q

Striker firing pin

A

A firing pin which carried inside the blot and receives its forward momentum from its own spring, when activated by the trigger not struck by a hammer.

25
Fixed firing pin
It's own mass provides the energy. A protrusion machined into the bolt/ breech which punctures the primer when the bolt has fully chambered the cartridge.
26
Two types of primers
Boxer: one flash hole. Has a cup shaped igniting system having the anvil and flash powder built in. (Reloadable) Berdan: two flash holes. Contains only the flash powder, the anvil is part of the cartridge case and has two flash holes. (Non-reloadable)
27
8 locking systems
``` Rotating bolt Rising/ lowering bolt Swinging bolt Rising barrel Rotating barrel Rollers Locking block Locking flaps ```
28
Operating systems
``` Bolt action Blowback Delayed blowback Recoil Recoil with gas assist Gas operation Manual pump Revolving cylinder ```
29
Three types of gas systems
Gas blast Gas tappet Gas direct
30
Barrel
The portion of a weapon through which a projectile is propelled by the action of gases generated by the burning of propellent charge.
31
Beech
The outside rear face of the barrel which meets the face of the bolt or breechblock.
32
Components of a bullet
The bullet, powder, case and primer.
33
Ejector
A cam or projection inside the receiver against which the cartridge case strikes and is thrown clear of the mechanism after it has been drawn from the chamber by the extractor.
34
Extractor
A component the engages the rim or extractor groove of the cartridge case while the cartridge is chambered. After firing the extractor withdraws the case from the chamber when the action opens.
35
Feed pawl
A hinged component of the feed mechanism designed for limited movement in one direction. This pawl acting through a lever engages succeeding cartridges in the feeding system and draws the cartridge into position for chambering.
36
Firing pin
The part of the firing mechanism that strikes or contacts the primer of the cartridge to cause ignition to fire the weapon.
37
Grooves
The portion of the rifling in a barrel that in conjunction with the lands imparts a spinning motion to a bullet.
38
Hammer
The component of the firing mechanism that imparts a sharp blow to the firing pin to initiate the primer.
39
Muzzle flaah
A incandescent flash in the air from the muzzle of the weapon which occurs when the bullet leaves the barrel. This flash is caused by the expansion of the emerging powder gases, ignition of oxygen in the air and expulsion of burning powder grains.
40
Rate of fire
The number of rounds which a weapon can fire in a minute, normally given in rounds per minute. RPM Sustained ( normal fire rate) Rapid ( trying to gain fire superiority) Cyclic (combat emergencies, maximum RPM)
41
Primer
A small charge that is detonated by the firing pin which in turns ignites the powder or propellant charge in the cartridge.
42
Rifling
A series of spiral grooves in the bore of a barrel which imparts a spinning motion to the bullet as it travels the length of the barrel from the breach to the muzzle.
43
Trigger
A finger actuated lever used to activate the firing mechanism firing the weapon.
44
Trigger bar
A connecting bar operating between the trigger and the sear. Nothing more than an extension of the trigger.
45
Military cartridge
Diameter of the bullet times the length of the cartridge case expressed in millimeters.
46
SA and DA
SA: weapon will only fire when it has been manually locked. DA: Trigger bar will cock the weapon when the trigger is pulled and the sear will release the hammer.

Basic Operation Of Small Arms (1 decks)

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