whats open Bolt system in guns?
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Open bolt just mean that the bolt remain open until you fire the gun. When you fire, the bolt will go forward, push the ammunition into the chamber and lock the chamber. After the round is fired, the bolt unlock, is pushed back and will then lock open, ready to cycle again.
This is different than a closed bolt, which won’t lock back after firing. It will go forward, put a round in the chamber and then lock, ready to fire again.
The difference between the two is that open bolt will make it easier for heat to escape, making it often preferred for weapons that are designed to fire full auto continuously like most machine gun and some submachine gun (usually older design in the case of submachine gun).
The advantage of a closed bolt is that there is minimum delay between the trigger pull and the shot being fired. The bolt doesn’t need to go forward, chamber a round and lock before the shot is fire. This make the gun more accurate to shoot. In addition, since the chamber is closed and locked, there is less chance of dirt going in the mechanism. Most guns are this way.
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