Posted by Yukon58 on 1st May well 2023 I made a decision to go with this particular 16” upper for my Colt lessen following the fiasco With all the atf pistol brace ruling. I wasn’t about to fluff about so I went all Colt and am glad I did.Anything shorter than the usual 16-inch barrel is considered to be a short barrel rifle, or SBR except When