BRP XMG-99 on a full auto lower or with a DIAS.
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What's the difference between a pistol lower and a rifle lower?
The only physical differences between rifle and sbr is the barrel and gas tube length
The only differences between rifle/sbr and pistol is buffer tube, stock, barrel, and gas tube length.
The rest is just bureaucratic bullshit brought to you by your friendly government alphabet agencies.
ANYTHING less than a 16" barrel is considered a NFA / SBR or Pistol Upper. DEPENDING what your plans are. I have X SBR's and X pistol lowers (already set up as) How many uppers and what barrel length i have is irrelevant. As anyone, outside a Vague legal interpretation would agree.
AS for "chucking it on the lower" ONLY if you purchased the lower as OTHER or PISTOL.
Form 1 it so you don't have to have that ridiculously hideous brace on the end.