Silencer Thread - which is best???

[Pommy]

Yes the yanks have to pay and get a $200 USD "tax stamp" for each suppressor and can be waiting several months, maybe even over a year, for the paperwork to get approved.

So you tend to see them buying one suppressor that they can use on multiple guns, with muzzle devices for quick detach and adapting to different threads. So it helps have as few threads in use as possible, to ensure maximum cross compatibility.

The bore of the suppressor is usually bigger than needed for the similar reasons. Buy a 30cal and use it on both a 308 and a 223, buy a 45cal to use on a 45acp and a 9mm etc... and just eat any slight loss in efficiency, rather than paying the government and waiting another year.