thanks for the info...i have the bushnell trs-25 red dot that i'm going to put on a UTG 1" riser to co-witness with my iron sights....so i think the UTG 3x magnifier should line up as well.
I was lucky enough to get an mp 15-22 A1 for x-mas, I also picked up a bushnell trs-25 red dot togo along with it. I would like to see if anyone has paired up a FTS magnifier to pair up with the trs-25. I'm not sure if it's possible but primary arms offers a few different ones and mounts...