I just bought an MPA930 and love it. I bought both uppers and this gun never jams. The original upper that came with it was a side cocker with a muzzle break welded on. This piece seems to work fine except that sparks fly and burn my hand. My top cocker has been customized to be short like the threaded barrell but without the threads and work perfect. Anybody else have this problem? Other than that I am completely stocked with my gun. It is really acurate too 






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