Ive got a model 1 that I put some serious $$ into with optics etc and aftermarket parts, but all the stag original stuff remained, bolt carrier, barrel, etc and holy SH!T this gun runs like a top. Only problem is they don't tell you that you are going to bleed ammo when you take the thing out!!! It works like a champ and love shooting the thing. I had contemplated buying a 2k ar and then realized I would have no $$ left over to do anything else but stare at it in the safe. Go with stag and you will not be let down!