hey mags are no problem. Yeah P mags don't work but so what.Ive used a bunch C products mags same as in my Grendel, used various mags....no big deal. Never been in a wrestling match trying to remove mag either. There is a reason those are expensive guns. They did a lot of things right. Read about some of the torture tests people over on Gabe Suarez forum have done and you'll be a believer in polymer products. Some guys add NEU triggers....same as the Steyr AUGS, people are using various suppressors. adding rails......they're awesome. I'm about to figure out what suppressor I'm gonna use. I'll get a suppressor I can use on several guns. Probably use the same suppressor on my grendel, SteyrAUG and FS2000. I use a 338 Thunderbeast on my 338, 308, and creedmoor. It's all little shit. You may ave to find an adaptor for a gun or have one made even .....but it's better than spending another $1500 or $1800 on a can.