WHAT DOES KNIGHTS ARMAMEN FOR SALE MEAN?

So, perhaps it could in fact be a lot more proper to say "internal piston" for immediate gasoline impingement and "external piston" for brief-stroke piston Procedure. But, we're trapped with the terminology in vogue and need to move beyond semantic pettiness.* These hold the normal black e3 bolt and upper receiver as pictured.  As outlined by Knig