So this may be a dumb question, but I am wondering which rifle you would buy if your were going to set up a semi-auto sniper rifle. I have a DPMS .308 AP4 and a Leupold mark 4 3.5 x 10 x 40 LR/t optic. I was thinking of trading the DPMS out, and some cash, for a Sprinfield M1A. Any advice would...