Posted by Yukon58 on 1st May perhaps 2023 I chose to go using this type of 16” upper for my Colt lower after the fiasco Along with the atf pistol brace ruling. I wasn’t about to fluff about so I went all Colt and am happy I did. If you https://colt-9mm-upper17394.frewwebs.com/27233793/a-review-of-colt-smg-upper-receiver