First Welcome to P.M., you'll enjoy the folks and info here. Second, you won't buy an R-15 in 308 cause they don't make it. What you need is an R-25. Makes and models are pretty much a toss up. Find one you like and go for it. I would suggest staying with the name brands, Rock River, DPMS, ect. Then there are the customs, larger investments, better bells and whistles.