Looking for a cheap AR15 that's reliable. Not picky on price or accessories. But I prefer something with an M4 barrel, flat top (A3), and adjustable butt stock. Since that's what platform I have and that's what I want to train in. It just has to shoot when I want it to. I don't want to bang up my safe queen AR. Looking for a plinker that I can practice in the rain, mud, snow, etc. My budget will only allow me to spend $500-$600 max. Please do not offer me any rifles twice my budget. Please PM me and tell me what you have and how much.