COLT 6721 UPPER FOR SALE FOR DUMMIES

 Truthfully, I would not shoot one.  Time to maneuver on to a fresh rifle.  Get an LMT or HK if you want armed forces design pistons.    Colt has little interest in aiding you out.  They deserted that task prior to their previous personal bankruptcy.I wasn't capable of finding nearly anything about this, is it possible to link a source? I did