5 SIMPLE STATEMENTS ABOUT COLT 6943 UPPER FOR SALE EXPLAINED

I'll try out to search for some. The piston rings appear to be the bolt rings but at scaled-down. The outer diameter is about .375 of an inch along with the internal diameter about .310 of the inch. Truthfully, I would not shoot one particular.  Time to move on to a completely new rifle.  Get an LMT or HK if you prefer navy style pistons.    C