Posted by Yukon58 on 1st May perhaps 2023 I made a decision to go with this 16” upper for my Colt lower after the fiasco Along with the atf pistol brace ruling. I wasn’t intending to fluff all around so I went all Colt and am happy I did. AR15.COM https://collinivgpy.theblogfairy.com/26469336/an-unbiased-view-of-colt-10-5-inch-9mm-smg-upper-receiver-assembly