THE 5-SECOND TRICK FOR COLT 6933 FOR SALE

 Honestly, I would not shoot just one.  Time to maneuver on to a brand new rifle.  Get an LMT or HK if you want army model pistons.    Colt has no interest in serving to you out.  They deserted that challenge before their very last individual bankruptcy.If you are competing in a contest with your gun, getting upgraded Colt AR15 Upper Receiver