I'd go for the accurate mag if you're buying one, but I like metal mags better. If you have a few 308 mags sitting around and don't mind sacrificing one they can be modified if you're handy. I narrowed the inside of one by gluing some material inside it on the walls then adjusted the feed lips for small rifle sized cartridges. Mine was for a 204 Ruger but same concept. It's a 5 round 308 mag that now holds 7 cartridges of 204 Ruger.