Realistallly, you have a better likely hood of getting SBR/SBS, as there is no good rational basis reason that a 15.9 or hell 7 in, 10.5 whaterver, barrel is much different than 16. Concealment? So what! Pistols exist and are carried by million so people every day. Suppressors, as a hearing safety device, off the NFA before any FA.

Even then i give it.. 5%, maybe 10%.

Id love to be wrong though.