ABOUT COLT 6920 UPPER RECEIVER

 Truthfully, I would not shoot one particular.  Time to maneuver on to a brand new rifle.  Get an LMT or HK if you want military fashion pistons.    Colt has little interest in encouraging you out.  They abandoned that job ahead of their past bankruptcy. Truthfully, I would not shoot 1.  Time to move on to a whole new rifle.  Get an LMT or