Is this the .308 predator or the .223 predator? When you say "jams", does that mean failure to eject or failure to feed? Are you double feeding? (I've never seen a double feed on a rifle, but I suppose it could happen?) RRA's are built to really solid. This is going to great later down the road, but sucks for a break in. Don't be afraid to hit the magazine followers with a bit of lube. The buffer can get a quick squirt too. Many of the guys here, myself included, soak our BCG's in Mobile1 full synthetic motor oil (5w40 for me). Wipe down with a rag after soaking for a few days. Go back to shooting like normal.