Posted by Yukon58 on 1st May perhaps 2023 I decided to go with this particular sixteen” upper for my Colt reduced following the fiasco Using the atf pistol brace ruling. I wasn’t going to fluff close to so I went all Colt and am happy I did. WARNING This solution https://colt-10-5-inch-9mm-smg-up74174.blogdemls.com/26503399/the-5-second-trick-for-colt-10-5-upper