[Pollster1]

I’d like to hear what ATF says about this shotgun. My guess: they will try to make it require a tax stamp, regardless of the letter of the law.

All restrictions on silencers should be repealed (along with most federal and state restrictions on our individual, God-given right to keep and bear arms).

[grobdriver]

The Metro barrel is ported along its entire length, which allows gas to bleed off a little at a time. The Metro is so long that most of the gases are gone by the time they get to the muzzle.

I think he'll be OK.
It's not a device that "captures" the gases - it just bleeds them off through a ridiculously long barrel.

Even the knuckleheads at BATF&E should recognize that.

[riverrunner]

This system has been around for many years.

nothing has been done about it.

[marktwain]

It has been around for quite a while. I have one, and used it a bit. That long barrel takes a bit to get used to. You will want to use the Federal sub-sonic loads. Then it sounds about as loud as a .22