Anyone know much about these? I want to SBR it in a semi and see they have a carbine model for civilians or a pistol version. I think purchasing a pistol version but don't know if a buttstock can be added to it like an AR? Anyone know?

It looks like a buttstock would slide right onto the rear.

It's sig, I wonder if they will make a "brace" for it so you can skip the tax stamp?

I'm not sure? I haven't seen the brace up close so don't know how comfortable or if they are solid enough to use as a stock? Then also comes into the legal dilemma if I shoot it like a stock will it create any legal hassles instead of using it as a brace?

They have a (C) model for carbine that has a funky looking barrel that I figured would be too much headache to deal with if going to SBR it.

I like that it can be converted into a 357 sig or 40 caliber as well.