Ah....... in those sorts of examples we're not comparing like with like. That's not force matching or anything......... That's fraud!

A matching numbers gun is exactly what they all were when they left the Armourers shop. But while we matched hundreds of things we didn't force anything. It was done properly. The closest a real Armourer got to such a notion was the term '.....gently swage the head to a rounded form.......' when fitting L1 bayonet grips.