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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
How do civilians measure calibers
Across the bore from land to land in one hundredths of an inch
26
How does military measure calibers
Diameter of the bullet x the length of the cartridge case measured in MM
27
Sear
A component retained under spring tension that releases, by means of a trigger, either a firing pin, hammer, or bolt
28
Trigger
A finger actuated lever used to activate the firing mechanism firing the weapon
29
Trigger bar
A connecting bar operating between the trigger and the sea. Nothing more than an extension of the trigger
30
Types of firing
Single action Double action Semi-automatic Automatic Selective fire
31
Recoil
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
Components of a shotgun shell
Crimp Wad Shot Powder charge Cartridge Brass head Primer
33
Muzzle devices
Flash suppressor Muzzle breaks Compensators Hybrids
34
Methods of mounting (silencers)
Direct thread Thread overbreak Rachet lock Locking collar 3 lug Reflex
35
Barrel types
Simple Mono-core K baffle Radical cone
36
1 MOA
1.047 1 rounded Less than .05 error @900M or 1000yds
37
1 MILS
3. 375 3. 5 rounded Error less than 1in @ 900M or 1000yds
38
Double action
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
Single action
The weapon will only fire when it has been manually cocked
40
3 types of recoil
Short action Long action Inertia
41
Sights
Adjustable Fixed Back up
42
Adjustable sight FORS meaning
Front, opposite, rear, same
43
Military bullet types
Spitzertip (boat tail) Flat-base Round nose
44
7 components of shotgun shells
Crimp Case Shot Wad Powder charge Brass head Primer
45
How are shotgun gauges measured
Determined by the number of lead balls of a given diameter required to make one pound of that size ball
46
Standard shotgun shell
2 3/4 in
47
Magnum shotgun shell
3” 3 1/2”
48
Chokes
A tapered constriction at the barrels bore at the muzzle end. Chokes tighten the pattern resulting in an increase of maximum effective range
49
Types of chokes
Full Modified Improved cylinder Cylinder
50
Battle sight
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
Fluted chamber
A chamber that allows gas to leak around the cartridge during extraction
52
Grooves
The portion of the rifling in a barrel that in conjunction with the lands imparts the spinning motion to a bullet
53
Gasport
In gas operated weapons a hole is machined into the barrel wall through which gas travels into the gas cylinder
54
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. 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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