Can see the rationality about a lot of complex shaped rubber inside the silencer - after all rubber absorbs a lot of sound energy, converting it into heat - in addition to its absorbing some heat of the blast but metal probably is better for that.
Some silicone rubber is very heat resistant and would make up some nice filler, definitely going to use something like that in my current de Lisle like project.
I have a shot out SMLE that will be dedicated to lead boolits with a 15" barrel. I need to take off exactly 9" of the 24" whippy barrel to allow me to put a 16M2 thread on it, 16mm being the barrel diameter at 9 inches from the business end. The suppressor won't index on the thread so I can thread it with a hand tool. Shame for the rifle as all matching numbers etc, but shot out is shot out.
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