SBR a Calvary Arms plastic lower/buttstock?
 

Has anyone ever SBR'd a Calvary Arms plastic lower/buttstock?

I bagged one of the Noveske 10.5" .300 Fireball barrels a week ago. I thought about doing a Form 1 for an SBR on the plastic lower and another Form 1 on a titanium 9mm suppressor for it.

My concern is engraving the plastic lower, any challenges with that?

Does NFA require it to be metal?

Any thoughts please.

Theres no reason that you couldnt register the plastic lower, like all NFA items you would need to put your Name City and State 1/8 tall 3 thousands deep into it as you are the manufacture of the SBR.