I am looking to get an AR in a few months but I'm not sure were to put the money. My budget is around 2500 but I can go to 3000 if I need to. I want a carbine/16" length AR for home defense/shtf. I've been looking at buying a BCM upper and lower and any other internals from them. With whats left I want to get a nice optic, a vertical grip, 2 piece quad rail, rear BUIS, half dozen PMAGS from MAGPUL and the rest would be spent on ammo and maybe a better collapsible stock. Does this seem like a good way to get started in the AR world or are there better options out there based on my budget?