I shot one quite a bit a few summers ago and another in 50 AE recently. I think they need a more dedicateed system for using them. AR's were concieved and built for 556 not Africa Big 5. Mags look the same but with a different follower designed to feed rounds from single stack so you get less than half capacity, which is an issue to some being that round was developed as an option for CQB range. The alloy recievers are too brittle for the pressure and recoil. However, they seem to work okay and although they are loud, it's pretty fun, too. It is a real bullet and you need to be careful when loading them up.