Matt Rittman, a 3D motion designer from Waukee, Iowa, has recently published a beautiful 3D animation demonstrating how the mechanism of a typical AK rifle works.A 3D animation created in Cinema 4D and After Effects showing how an AK-47 rifle works. Corona renderer was used in order to create realistic materials and reflections.
This animation also gives a good visual reference to show a small design feature of the AK rifle that is often misunderstood. It seems that the only purpose of the bolt carrier tail extension is to start the cocking of the hammer, however, this extension is also an out-of-battery safety.
The automatic machine gun is based on a gas recoil system that uses the hot expanding gases of a bullet being fired to automatically rechamber the next round, and surprisingly, it appears to work even better under water.
If the action is not locked and the hammer accidentally falls, it won’t be able to reach the firing pin and will hit the bolt carrier tail. Even it the hammer manages to push the bolt carrier forward and retain enough energy to hit the firing pin, it will still be safe discharge because the action will be already locked..