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Put your Colt upper back on your SBR lower and verify functionality. If that works properly, try the Rock River bolt in the Colt upper. Assuming that all works, try the Colt bolt in the RR upper.
My prediction is that your RR bolt is hanging up on the hammer, but you are not giving us a lot of info to work with.
Andy
Last edited by AndyLate; 07-18-20 at 11:45.
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