Locking Systems Detailed

Question 1

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Answer 1

Locking systems are used to maximize the pressure in the chamber as gases are forced in one direction which increases velocity and ranges

Question 2

Rotating Bolt (M16, AK-47)

Answer 2

The bolt rotates left or right to lock behind the breech

Question 3

Rising/Lowering Bolt (240)

Answer 3

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.

Question 4

Swinging Bolt (SGM)

Answer 4

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

Question 5

Rotating Barrel

Answer 5

Instead of the bolt rotating, the barrel rotates

Question 6

Rising Barrel (1911A1)

Answer 6

The barrel rises up into the slide to lock the barrel and slide together

Question 7

Locking Block (M9, P38)

Answer 7

Lugs that engage into recesses of the slide/receiver that allow for locking to occur

Question 8

Locking Flaps (RP-46, RPD, DShK)

Answer 8

Loose plates located on the bolt swing out locking into recesses in the receiver

Question 9

Roller (MG3/74, MP5, G3A4)

Answer 9

Rollers push out of the left and right sides of the bolt to lock in to the breech.
Delayed blowback operating system