I've been building my 308 for quite some time mostly just waiting on parts to come in, started with a DPMS 308 lower with collapsible stock, switched to the magpul prs stock, put a stainless 24" bull barrel 1 in 10 twist with free floating hand guard on.. I'm very new to the long range side of ARs I'm just curious as to how far this gun can possibly shoot accurately and maybe a few suggestions as to what scope i would need. I was thinking of buying a Leupold Mark 4 4.5-14x40mm mil-dot reticle, which may be a little bit of over kill but I would easily find use for it in the future. Any information or suggestions would be appreciated.