whats open Bolt system in guns?
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I assume you are talking about a firearm that fires from an open bolt.
This just refers to that the firearm using a simple direct blow back system and when cocked back the entire reciprocating system is held to the rear. When the trigger gets depressed it releases the bolt picking up a round and firing it all in one motion.
There are vary few examples that are compliant with the 1986 machine gun ban as it is a difficult system to make semi-auto. But a few famous examples of a firearm using this system is the M3 Grease gun, Stein, the Thompson, and the UZI.
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