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18B > Locking Sys/ Op Sys/ Sights/ Feeding/Cartridges/Shotguns > Flashcards

Locking Sys/ Op Sys/ Sights/ Feeding/Cartridges/Shotguns Flashcards

1
Q

Locking System

A

Used to maximize the pressure in the chamber as gases are forced in one direction which increases velocity and range.

  1. Rotating Bolt- M16, AK47
  2. Locking Block- M9, P38
  3. Rising/Lowering Bolt- 240
  4. Roller- MG3/7, MP5, G3A4
  5. Rising Barrel- 1911A
  6. Locking Flaps- RP-46, RPD, DSHK
  7. Swinging Bolt- SGM
  8. Rotating Barrel
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2
Q

Rotating Bolt

A

The bolt rotates left or right to lock behind the breech.

M16, AK47

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3
Q

Locking Bolt

A

Lugs that engage into recesses of the slide/receiver that allow for locking to occur.
M9, P38

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4
Q

Rising/Lowering Bolt

A

The rear of the bolt rises or lowers into a locking recess of the receiver.
Bolt does not actually lower; the bolt guide lowers as it drops in to the locking shoulder.
240

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5
Q

Roller

A

Rollers push out of the left and right sides of the bolt to lock in to the breech.
Delayed blowback operating system.
MG3/7, MP5, G3A4

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6
Q

Rising Barrel

A

The barrel rises up into the slide to lock the barrel and slide together.
1911A1

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7
Q

Locking Flaps

A

Loose plates located on the bolt swing out locking into recesses in the receiver.
RP-46, RPD, DSHK

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8
Q

Swinging Bolt

A

The rear of the bolt swings out of line with the bore into a locking recess.
SGM

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9
Q

Rotating Barrel

A

Instead of the bolt rotating, the barrel rotates.

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10
Q

Operating Systems

A
  1. Bolt Action
  2. Blowback (Simple)
  3. Delayed Blowback
  4. Recoil
  5. Recoil with Gas Assist
  6. Gas Operated
  7. Manual Pump
  8. Revolving Cylinder
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11
Q

Bolt Action

A

The operator manually retracts the bolt to eject the spent cartridge and to chamber a new round by pushing the bolt forward.
M24, Win 1903

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12
Q

Blowback (Simple)

A

Works by pressure from the fired cartridge.
Only has 6 Cycles of Function as there are no locking or unlocking mechanisms.
Characterized by having heavier bolts to act as breechblocks for longer periods of time since there is no locking or unlocking mechanism.
Uzi, M12, L2A3

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13
Q

Delayed Blowback

A

These weapons have a locking system, which means there is a delay long enough for the round and excess gas to leave the muzzle before the bolt is fully unlocked.
P7 Series

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14
Q

Recoil

A 
Works by pressure from the fired round. The breech is locked so when the round is fired, the barrel moves to the rear with the breechblock or bolt in place. The breechblock remains to the rear while the barrel is forced forward by the spring. After the barrel is fully forward the breechblock is released, moving forward to chamber another round.
3 Types of Recoil Action
Long Action Recoil
Short Action Recoil
Inertia Action Recoil
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15
Q

Recoil with Gas Assist

A

Internal piston taps on the barrel to assist in unlocking the bolt; increasing the rate of fire and reliability.

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16
Q

Gas Operated

A 
Gases within the barrel are trapped and redirected
3 Types
Gas Blast
Gas Tappet
Gas Direct
17
Q

Gas Blast

A

Gas makes contact with a gas piston directly attached to the operation rod or slide.
AK

18
Q

Gas Tappet

A

Gas makes contact with the gas piston which then makes contact with the operating rod. The gas pistons and operating rods are separate parts.
M60

19
Q

Gas Direct

A

Gas goes out of the gas port into the gas tube and is carried directly to the bolt or bolt carrier.
M4

20
Q

Fixed Sights

A

Pistols and sub machine guns typically have fixed sights because they are used in close distances.

21
Q

Battle Sights

A

Range that allows you to hit the target between the throat and the waist without sight adjustment.
Exact range will vary depending upon the caliber of the weapon.

22
Q

Feeding Mechanisms

A
  1. Magazines
  2. Belts
  3. Clips
23
Q

Magazines

A
  1. Box- Staggered, In-Line (Single Stacked)
  2. Pan
  3. Drum
24
Q

Belts

A
  1. Split Link Belt (SLB)- Does not go all the way around the cartridge.
  2. Fully Encased Link Belt (FLB)- Link does go all the way around the cartridge.
  3. Disintegrating Link Belt (DLB)- Each link breaks apart.
  4. Non-Disintegrating Link Belt (NDLB)- Links will stay together in clusters
25
Q

Clips

A

Device used to rapidly load a magazine

* Stripper Clip, En-Block Clip

26
Q

5 Cartridge Case Types

A
  1. Rimmed
  2. Semi-Rimmed
  3. Rimless
  4. Belted
  5. Rebated
27
Q

Types of Ammo

A
  1. Center Fire

2. Rim Fire

28
Q

4 Components of a Cartridge

A
  1. Bullet
  2. Powder
  3. Case
  4. Primer
29
Q

2 Types of Primer

A
  1. Boxer (Reloadable)- Has an anvil built into the primer with flash powder built in. One flash hole.
  2. Berdan (Non-Reloadable)- Contains only the flash powder, the anvil is part of the cartridge case. Two flash holes.
30
Q

2 Types of Bullet Tips

A
  1. Spitzer Tip

2. Round Nose

31
Q

Types of Bullet Bases

A
  1. Flat Base

2. Boat Tale

32
Q

Cartridge Case Measurement

A

Military- Bullet diameter x cartridge case length expressed in mm
Civilian (Caliber)- The distance across the bore of a weapon measured from land to land expressed in hundredths of an inch

33
Q

Choke

A

The inside bore constriction at the muzzle end of the shotgun’s barrel is known as a “choke.” When a shot shell is fired, shot travels down the bore, exits the muzzle, and begins to spread out. Chokes also increase effective range.

34
Q

Types of Chokes

A
  1. Full
  2. Modified
  3. Improved
  4. Cylinder (None)
35
Q

Components of a Shot Shell

A
  1. Crimp
  2. Shot
  3. Case
  4. Wad
  5. Power
  6. Brass Head
  7. Primer
36
Q

Shotgun Case Lengths

A

Standard- 2 3/4

Magnum- 3 and 3 1/2

37
Q

3 Types of Recoil

A

Short Action
Long Action
Inertia

38
Q

M1911A1 Sear Spring

A

Left Spring Arm- Places forward pressure on the sear
Center Spring Arm- Places upward pressure on the disconnector
Right Spring Arm- Places outward pressure on the grip safety

18B (7 decks)

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