I got two steel mags with the gun and he also had two original Armalite AR10 Waffle mags that he threw in. The DPMS mags work fine the Armalites are a little tight in spots it seems-haven't shot it with them yet. Don't know how many mags I will get, if I get an AP4, then maybe quite a few, haven't decided yet. If I just have the LR I will probably only get 2-3 more and call it good. To me, it's kind of a special purpose rifle. I got my Super Sniper in and will get it mounted and out to the range again.
I went through my odd lots of .308 and came up with about 60 rounds of Hirtenberger, 40 of Lake City '85 etc....about 200 rounds of pretty decent ammo but not much of any one type. I am going to use that to continue to break in the rifle, hopefully the bolt will quit hanging up with some more rounds down range.
I replaced my pistol grip with a Hogue unit that I had laying around. I don't know that I will add alot more to the gun. The guy I bought it from had it really tricked out-he had a tactical charging handle, ambi bolt release, ambi mag release, lead weight in the buttstock etc....I didn't really want all that stuff and just took the rifle, match trigger and the rings. I need to get a Harris S type bipod for it and I'll be pretty much done with it.