AR with 16 inch or less barrel?

[GunLawyer001]

. . .
Sonny Crocket carried a Bren Ten
http://en.wikipedia.org/wiki/Bren_Ten

He did for part of the series.

He also carried a SIG-Sauer P220, a Detonics Pocket 9 as a backup (replaced later with a .45 ACP Detonics Combat-Master backup gun in an ankle holster), a Smith & Wesson Model 645, then a Smith & Wesson Model 4506.

Sonny didn't routinely carry anything other than a revolver or an automatic along the lines of a 1911, so any citizen who packs a MAC or an SBS under his arm will not fall within the "TV detective good-guy" matrix. When he used an M-16 or MP-5, it was always because they had pre-planned an assault. You don't want the jury to think that you pre-planned your defensive shooting, do you?

http://en.wikipedia.org/wiki/Firearms_in_Miami_Vice