SBR question

So is this still considered a pistol and legal without a stamp?

http://www.radicalfirearms.com/product-p/fp10.5-300hbar-10fgs-sb15.htm

trying to decide between that and this one

http://www.radicalfirearms.com/product-p/fp10.5-300hbar-10fgs.htm

Add a sig brace and a short barrel with no stamp a pistol ( they claim you can not shoulder it either ) not saying you can't away from a range.

Adjustable stock and a stamp with short barrel is a sbr


I have a 300blk with a sig brace ( pistol ) im waiting on my stamp for it to be a true sbr

Primary Arms has them for a bit less and in stock. I prefer the sig brace over just the tube.