WHAT DOES COLT 6921 FOR SALE MEAN?

 Honestly, I would not shoot just one.  Time to maneuver on to a completely new rifle.  Get an LMT or HK if you like military services design pistons.    Colt has little interest in helping you out.  They abandoned that task in advance of their very last personal bankruptcy.This element affords unmatched repeatability for mounting optical met