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?
In: Other
There a latch system near the back that’s depressed by the next cartridge in the magazine. As long as there are cartridges in the magazine, the latch can’t grab the bolt (the part that slide back).
Once the magazine is empty there’s nothing to hold the latching mechanism down, and it grabs the bolt on the next recoil, holding it open until a new round is chambered.
Edit:typo
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