You know Dave, I'm kind of on the fence on this one. I mean, great for Sig, if they have the funds and time to sue the ATF, I say go for it. I've always believed that NFA items should be over the counter. Heck if they still want to charge the NFA tax, fine, but let me have my item the same day.

Anyhow, to me the ATF has always ruled that baffles are basically the suppressor. Heck you can't even get replacement baffles without sending your can in. Any competent machinist could make a sleeve over that and have a suppressor, yes it would be illegal, but instead of shooting oil filters, all you have to do is get a sleeve. Having said that, the mono-core by itself I don't even see how you could call it a brake, we all know what it really is!