So I understand that when you fire an automatic rifle the gas sends the working parts rearward to pick up the next bullet, but when the last round is fired the working parts are fully rear and the hold open recess stays open. Why does it do this?
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There is an excellent (https://www.youtube.com/watch?v=NZX7X3pJgH8) from the US army that goes through all the parts of a small arms action and how they work, step by step.
It’s normally done with a latch that catches a bit of the magazine that pushes the bullets up, but doesn’t catch on the bullets (because they are round and the catch is located in a position they can’t easily be within the magazine).
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