I tried one on my converted SL8, and almost immediately removed it. You have to remove the paddle mag catch, so it’s not easy to swap back and forth, if you want to. Also, the AR mag catch is awkward since it has to be actuated by the left hand. I also seem to remember some issues with the BHO too. I don’t think it locked back on the empty mag anymore.
I went back to the paddle mag release. If you really need to use US mags for 922r compliance, I’d use the Magpul G36 mags.