HELPING THE OTHERS REALIZE THE ADVANTAGES OF COLT 6940 AR 15

I will test to search for some. The piston rings appear to be the bolt rings but at smaller sized. The outer diameter is about .375 of an inch and also the internal diameter about .310 of an inch.Purchasing and delivery by way of Charlie’s is not difficult, but there's some data you need to know. Only a federally accredited firearms seller may p