Posted by Yukon58 on 1st Could 2023 I decided to go using this sixteen” upper for my Colt lower after the fiasco with the atf pistol brace ruling. I wasn’t going to fluff about so I went all Colt and am glad I did.The best part is, You can utilize 9mm Journals with your pistol by buying a 9mm conversion package to be able to change it to an AR-