Как работает AK-47
How the AK-47 works?
When trigger is pulled, hammer releases and strikes firing pin. Firing pin punctures bullet primer, which contains a compound that explodes to ignite the gun powder. Expanding gases force the gas piston backward. The bolt carrier is forced back, ejecting casing. Bolt pulls a new round from the magazine and inserts into the barrel. Bolt carrier also resets hammer to starting position. The sear keeps hammer held in place until bolt carrier returns to position.
To fire in automatic, the selector is moved to the middle position. This holds the disconnector back, keeping it from catching the hammer while trigger is pressed.