I have a bunch of Orlite mags and a Bushmaster V-match.
They don't fit.
They fit in the Bushmaster bull pup, but that is not an AR, it just uses AR mags.
I talked to Clint at Fulton Armory. He said to take a knife and cut a little of the interfering part off the mags. It is the Bushmaster's fault, so I just keep the mags and that rifle separte.