When the thickness of five stacked quarters. Solution Part One – The Colt 9mm buffer is 3.300″ long. I prefer a more professionally engineered solution that is simpler and has less parts. Some thrifty and clever shooters have added spacers, five stacked quarters etc in their buttstock, added weights to their buffers and made modifications to the buffer to increase it’s overall length and weight. A different 9MM buffer is needed and possibly a higher quality buffer spring. This energy and velocity combined with the over travel condition of the bolt cause premature failure of the 9MM AR Bolt Catch.įix and Prevent 9MM AR Bolt Catch, Bolt Stop Failureįortunately the solution and prevention are pretty easy. Reason Two – The blow back nature of the 9MM AR recoil system provides the 9MM bolt with some serious energy and velocity. This over-travel condition allows the 9MM AR Bolt to travel too fast in the forward direction causing premature failure of the bolt catch. This unfortunately allows the 9MM bolt to travel further down the buffer tube than necessary. ![]() ![]() Reason One – A 9MM AR Bolt is shorter than a milspec AR-15 Bolt Carrier Group.
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