I'm looking for a lightweight (under 8 lbs) AR style .308 for hunting Moose, Bear, and Deer here in Maine. I like the DPMS LR-308L but at $1500 it's kinda pricey. Can I build my own AR style .308 with an 18"-20" barrel that will weight under 8 lbs, and if so what parts brands will work for my application?