Posted by Yukon58 on 1st Might 2023 I made a decision to go using this sixteen” upper for my Colt reduced after the fiasco Together with the atf pistol brace ruling. I wasn’t about to fluff close to so I went all Colt and am glad I did. WARNING This https://colt105upper41730.spintheblog.com/26984294/what-does-colt-smg-upper-mean