Might I suggest a different route? Right now, a decent AR style rifle and a few mags will run you $2000- $2500. The herd smelled rain, and is in a stampede.
For HALF that money, find a good .22 rifle. And get a M-N 91/30 or M44. AND an 8mm Mauser- and maybe an SKS. There is a ton of MILSURP ammo out there CHEEEP for the SKS, M-N, and Mauser.
While everyone is is yelling the sky is falling, and trampling their neighbor to get into the gun show, you will be at the range- shooting. And laughing.
What we have here is... failure- to communicate.