COLT 6943 VS 6945 FOR DUMMIES

 Truthfully, I wouldn't shoot a single.  Time to move on to a brand new rifle.  Get an LMT or HK if you like military services model pistons.    Colt has no interest in supporting you out.  They deserted that challenge prior to their very last bankruptcy. Honestly, I would not shoot one particular.  Time to maneuver on to a brand new rifle.