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Base Ops > Base Ops > Flashcards

Base Ops Flashcards

1
Q

What are the 8 cycles of function?

A

Feeding, chambering, locking, firing, unlocking, extracting, ejecting, cocking

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2
Q

What are the 3 feeding mechanisms?

A

Magazines
Belts
Clips

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3
Q

What are the three types of magazines?

A

Box (staggered and inline)
Drum
Pan

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4
Q

Type of belts used in machine guns ?

A 
Split link
Fully encased link
Non-disintegrating link 
Disintegrating link 
S F N D
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5
Q

Two types of clips?

A

En-Bloc

Stripper clip

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6
Q

Five types of cartridges?

A 
R, Sr, Rl, B, Re
Rimmed
Semi Rimmed
Rimless 
Belted
Rebated
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7
Q

Components of a cartridge?

A

Bullet, powder, case, primer

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8
Q

Five varieties of firing pins?

A 
Free floating 
Inertia
Percussion
Striker
Fixed
(FIPSF)
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9
Q

3 ways firing pins receive their energy?

A 
1. A larger mass strikes them
Free floating
2. A spring provides their energy 
Inertia, percussion, striker
3. Their own mass provides their energy
Fixed
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10
Q

Y

A

U

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11
Q

Inertia firing pin

A

Uses spring
M1911A1
USP
BHP

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12
Q

Percussion firing pin

A

Uses spring

M60, M2HB

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13
Q

Striker firing pin

A

A squeeze-cocking system is what compresses the firing pin

P7

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14
Q

Two types of primers?

A

Boxer

Berdan

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15
Q

Difference between boxer and berdan primers?

A

Boxer- one flash hole.
Anvil and flash powder built in
Berdan- two flash holes.
Contains only flash powder, the anvil is part of cartridge case, non-reloadable

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16
Q

What are the 8 Locking systems

A 
Rotating bolt 
Rising/lowering bolt
Swinging bolt
Rising barrel 
Rotating barrel 
Locking block 
Locking flaps
Roller
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17
Q

What are the Eight operating systems?

A 
Bolt action 
Blowback
Delayed blowback
Recoil 
Recoil with gas assist
Gas operation 
Manual pump
Revolving cylinder
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18
Q

3 types of gas systems?

A

Gas blast
Gas tappet
Gas direct

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19
Q

Sifferent categories of ballistics?

A

Internal ballistics
External ballistics
Terminal ballistics

20
Q

What is 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 weapon.

21
Q

What is the Breech?

A

The outside rear face of the barrel which meets the face of the bolt or breechblock

22
Q

What is the Breechblock?

A

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

23
Q

What is Compensator?

A

A device attached to the muzzle of a weapon designed to allow the gases following the bullet out of the muzzle to be deflected upward through slots in the top surface of the compensator. The lower portion of the compensator is solid, so that while some gas escapes through the top, gas is also pressing against the bottom.

24
Q

What is a Disconnector

A

A device incorporated into the action of a weapon which 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

25
Q

What is an Extractor

A

A component that engages the rim or extractor groove of the cartridge case while the cartridge is in the chamber.

26
Q

Firing pin

A

The part of the firing mechanism that strikes or contacts the primer of the cartridge to cause ignition to fire the weapon

27
Q

Flash suppressor

A

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

28
Q

Headspace

A

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

29
Q

Muzzle break

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

30
Q

Muzzle flash

A

The incandescent flash in the air at the muzzle of the weapon which occurs when the bullet leave 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

31
Q

Muzzle velocity

A

The computed velocity in fps at which the bullet leaves the barrel

32
Q

Primer

A

The small charge that is detonated by the firing pin, which in turn ignites the powder or propelling charge in the cartridge

33
Q

Rifiling

A

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 breech to the muzzle

34
Q

Sear

A

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

35
Q

Trigger

A

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

36
Q

Trigger bar

A

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

37
Q

Types of firing?

A 
Single action SA 
Double action DA
Semi Automatic 
Automatic
Selective fire
38
Q

Muzzle devices

A

Flash suppressors
Muzzle breaks
Compensators
Hybrids

39
Q

What is an 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.

40
Q

What does a fluted chamber do?

A

Uses to maximize energy for extraction, also leaves horizontal burn marks on cartridge case

41
Q

3 types of trajectory?

A

Rising branch
Max ordinate
Falling branch
(Line of sight, trajectory, boreline)

42
Q

Which operating system has no locking system?

A

Blowback

43
Q

How do you measure a military cartridge?

A

Bullet diameter X Cartridge csse length

In millimeters

44
Q

How do you measure a civilian caliber?

A

Across the bore measured from land-to-land in 1/100ths of an inch

45
Q

Types of trajectories?

A

Rising branch
Falling branch
Max ordinate

46
Q

Types of chokes in shotguns?

A

Full- tight narrow pattern
Modified- medium width
Improved cylinder- wide open spread
Cylinder- widest

Base Ops (1 decks)

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