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thank you for your reply. Mine does have a last round bolt hold open, but I have not tinkered with it as I have only previously built 223 ARs - I figured that’s what it was but it’s crazy because I have only shot maybe 50 - 60 rounds out of it - all worked fine then I take it to go shoot again...

Hello everyone. My name is Hamilton. This is my first post by the way I wish I wasn’t having to make it but I’m interested in what you guys have to say about this.. so you’ve heard time and time again that bolts don’t lock back on the last round being fired. Don’t confuse that with my problem...