I have a BCM mid-length mod 2 complete gun with BCM BCG and I am having a problem with my bolt locking back on the last round. The ammo I am using is PMC bronze 223. I know it is a low pressure round but what is bothering me is when I changed out my BCM BCG with my DD BCG the bolt locks back every time. I am using magpul pmags. Can anyone give me some advise on what could be the problem or what to do. Any info is appreciated.


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