I use a Gemtech Multimount for two MKEs w/ 3 lugs, a 1/2x28 threaded 9mm AR, several pistols threaded 13.5x1LH and I've got another adapter threaded 5/8x24 for 300BLK subs, so it's a very versatile can. Although, don't plan on going full auto mag after mag with a Multimount as Gemtech doesn't recommend heavy full auto fire with that can. I also have a 40 Osprey that I've used on a HK USP .40 and the 9mm pistols and MKEs also. A 3 lug adapter would seem a little difficult with the Osprey, but I'm just an enthusiast, not an engineer.