The only ones out that'll work for it are the ones you see on that page that say DPMS. I ordered a couple of the 4 round mags for mine from that website and the shipping was pretty fast. I've heard from a few different people that Magpul is supposedly making the PMags in .308 but I haven't seen or heard anything concrete.
"Breathe when you can, shoot when you should."
"Qui desiderat pacem, bellum praeparat; nemo provocare ne offendere audet quem intelliget superiorem esse pugnaturem"