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18B Light Weapons Characteristics > Base Ops > Flashcards

Base Ops Flashcards

1
Q

8 cycles of operations

A 
Feeding
Chambering
Locking
Firing
Unlocking
Extracting
Ejecting
Cocking
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2
Q

Feeding mechanisms

A

Magazines

Belts

Clips

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3
Q

Types of magazines

A

Box
(Staggered, in-line)

Drum

Pan

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4
Q

Types of belts

A

FED MLB

FEND MLB

SLD MLB

SLND MLB

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5
Q

Types of clips

A

En bloc

Stripper clips (charger clip)

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6
Q

5 types of cartridge

A

Rimmed

Semi-rimmed

Rimless

Belted

Rebated

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7
Q

5 types of firing pins

A

Free floating

Inertia

Percussion

Striker

Fixed

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8
Q

Three ways a firing pin receive their energy

A

A larger mass strikes then (free floating)

A spring provides the energy( inertia, percussion, striker)

Their own mass provides the energy (fixed)

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9
Q

2 types of primers

A

Bóxer

Berdan

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10
Q

8 types of Locking systems

A

Rotating bolt

Rising/lowering bolt

Roller

Rising barrel

Locking flaps

Swinging bolt

Locking block

Rotating barrel

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11
Q

8 types of Operating systems

A

Bolt action

Blowback

Delayed blowback

Recoil

Recoil w/ gas assist

Gas operation ( gas direct, gas blast, gas tappet)

Manual pump

Revolving cylinder

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12
Q

3 types of ballistics

A

Internal

External

Terminal

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13
Q

3 parts of trajectory

A

Rising branch, maximum ordinate, falling branch

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14
Q

Breechblock

A

A component that seals the breech and blocks gases from the fired cartridge. (Bolts in rifles, slides in pistols)

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15
Q

Buffer

A

A part intended to absorb the shock of moving parts or check the motion of major components during recoil and or counter recoil.

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16
Q

Chamber

A

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

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17
Q

Disconnector

A

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

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18
Q

Ejector

A

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

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19
Q

Extractor

A

A component that engages the rim, or extractor groove of the cartridge case while the cartridge is in the chamber. After firing the extractor withdraws the case from the chamber when the action opens

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20
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 gases reduces the flash

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21
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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22
Q

Lands

A

The raised portion between the grooves in the bore of a gun that imparts the spinning motion to the bullet

23
Q

Machine gun rates of fire

A

Sustained

Rapid

Cyclic

24
Q

Rifling

A

A series of grooves in the bore of a barrel which imparts a spinning motion to the bullet as it travels the length of the barrel from breech to muzzle

25
Q

How do civilians measure calibers

A

Across the bore from land to land in one hundredths of an inch

26
Q

How does military measure calibers

A

Diameter of the bullet x the length of the cartridge case measured in MM

27
Q

Sear

A

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

28
Q

Trigger

A

A finger actuated lever used to activate the firing mechanism firing the weapon

29
Q

Trigger bar

A

A connecting bar operating between the trigger and the sea. Nothing more than an extension of the trigger

30
Q

Types of firing

A

Single action

Double action

Semi-automatic

Automatic

Selective fire

31
Q

Recoil

A

The rearward movement of a weapon caused by the expansion of the powder gases which act to trust the projectile forward in the barrel and react to move the weapon rearward

32
Q

Components of a shotgun shell

A

Crimp

Wad

Shot

Powder charge

Cartridge

Brass head

Primer

33
Q

Muzzle devices

A

Flash suppressor

Muzzle breaks

Compensators

Hybrids

34
Q

Methods of mounting (silencers)

A

Direct thread

Thread overbreak

Rachet lock

Locking collar

3 lug

Reflex

35
Q

Barrel types

A

Simple

Mono-core

K baffle

Radical cone

36
Q

1 MOA

A

1.047

1 rounded

Less than .05 error @900M or 1000yds

37
Q

1 MILS

A
  1. 375
  2. 5 rounded

Error less than 1in @ 900M or 1000yds

38
Q

Double action

A

The trigger bar will cock the weapon when the trigger is pulled and the sear will release the hammer when the trigger has reached the maximum rearward movement

39
Q

Single action

A

The weapon will only fire when it has been manually cocked

40
Q

3 types of recoil

A

Short action

Long action

Inertia

41
Q

Sights

A

Adjustable

Fixed

Back up

42
Q

Adjustable sight FORS meaning

A

Front, opposite, rear, same

43
Q

Military bullet types

A

Spitzertip (boat tail)

Flat-base

Round nose

44
Q

7 components of shotgun shells

A

Crimp

Case

Shot

Wad

Powder charge

Brass head

Primer

45
Q

How are shotgun gauges measured

A

Determined by the number of lead balls of a given diameter required to make one pound of that size ball

46
Q

Standard shotgun shell

A

2 3/4 in

47
Q

Magnum shotgun shell

A

3” 3 1/2”

48
Q

Chokes

A

A tapered constriction at the barrels bore at the muzzle end. Chokes tighten the pattern resulting in an increase of maximum effective range

49
Q

Types of chokes

A

Full

Modified

Improved cylinder

Cylinder

50
Q

Battle sight

A

The range that allows you to hit the target between the throat and waist without sight adjustment. Exact range varies with caliber of weapons

51
Q

Fluted chamber

A

A chamber that allows gas to leak around the cartridge during extraction

52
Q

Grooves

A

The portion of the rifling in a barrel that in conjunction with the lands imparts the spinning motion to a bullet

53
Q

Gasport

A

In gas operated weapons a hole is machined into the barrel wall through which gas travels into the gas cylinder

54
Q

Chamber

A

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

18B Light Weapons Characteristics (2 decks)

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