Wartime, home made silencer

[browningautorifle]

the problems with an exit hole can be resolved by the material that is placed behind it.

I think you're talking about "Wipes"? A "Plastic" baffle that may actually be pierced by the first bullet and conform exactly to the exit size required? I've used a rubber type at the front and it would eventually wear the hole too big. Of course this is all working with the theory of single shots...not auto. Once you go auto all material degrades at an exponential...I did an M3 once and actually burned holes in the stainless screen.