Note that these uppers are billet and most rails with anti-rotation ‘tabs’ do not fit. BCM is an exception and work fine. I also carry Griffin Armament rails that do not have any anti-rotation tabs that work fine as well.
I have complete uppers listed here: https://c3junkie.com/?product_cat=uppers
It is hard to anticipate what each person wants so please contact me if there is some permutation that you are looking for that I do not list.
