Aero Precision, you buy a complete upper from them, you pick, then you pick your complete lower set up. you can get a kick ass rifle for 1000 easy. my fir rifle was from Aero, and is my go to rifle every time. took a wild pig at 60 yards from a boat. 20 yards from the shore she was another 40 beyond the shore line and behind two tree side by side with 6 inches between them. its a dead on rifle. most people will tell you these fancy rifles that sound cool look tactical but are a failure as a proper gun. like the guys with 4 flashlights, side optics scopes for 1000 yards on a gun built for 3oo yrd shots.