05-19-2015, 01:42 AM
Yes you would need two stamps, one SBR and one for the suppressor. You would have to have is made with a pistol gas system and I would think it would be really touchy getting it to cycle right, the gas port diameter would be tricky. I just got a 12.5" barrel with about a .070" gas port and its still over gassed a adjustable block is a must. With that short of a barrel your velocity will really suffer to I would think. I'm sure one of the other guys here will chime in with some hard facts.

