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If you pop out your bolt on your M4...where is the white plastic chunk that holds the piston centered? Is it all the way at the back...or has it slipped forward.
If it's slipped forward...the hammer might be clipping it as it drops forward. If it slips forward more you'll loose semi as well.
If that's the case, push it back and things should work as normal...if it doesn't then there is something else wrong.
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