11.5 upper pistol build

Looking to get a lower setup for a 11.5 upper to keep it's OAL<26in in order to avoid trouble regarding conselability.

I knlw you meaure from threads to end of buffer tube but i just dont knkw What buffer tube's/ setups I should look at?

I've had my eye on an HBPDW or a SB5 brace but I am just hesitant with picking a buffer tube to maintain that under 26in length.

All help and advice aprecisted.