FASCINATION ABOUT COLT 6943 VS 6945

I'll check out to look for some. The piston rings appear like the bolt rings but at smaller. The outer diameter is about .375 of the inch along with the internal diameter about .310 of the inch.If any FFL while in the chain has transferred a lower being a rifle at any level, it is a rifle. Owning an FFL does not make them geniuses or necessarily me