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.