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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First remember you have a magazine full of bullets in the gun. This magazine is a box, and a spring that pushes up a follower, which is the little plate the bullets sit on.
Say you’re on the last bullet. The bolt comes back, goes forward, strips a bullet, fires. But now there’s no bullet in the magazine, the follower is at the top position, and it pushes against a latch. Now the bolt comes back, goes forward, and catches against that latch, holding it open.
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