[bandit123]

I believe this to be a better option , why build it when you can just buy one , the 308 ar10 can hit and kill at 600 to 1000 yards . The bull barrel 18” is an excellent all around use gun , the 16” ap4 is lighter if you need to carry it alot
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=209447424
or
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=209577241
the main reason for the choice is its ability from 500-1000 yards is much better than .223 round , also they cost about 1000 dollars ( fairly reasonable price ) both would transition instantly from sniper use to up close battle well,
p.s. I have owned several dpms rifles and find the quality to be outstanding , never a problem with any of them

[cowboyway]

why build it when you can just buy one

You could ask the same question about reloading.

I start with stripped lowers and uppers and go from there. Got a partially finished lower on the bench right now.

BTW, I reload, too.