First thing, guns don't jam, they can have a malfunction - jam goes on toast. Second, learn to properly clean your rifle, keep the bolt and bolt carrier clean. Having said that, I have run over 500 rounds through my AR-15 rifles in competitions without a malfunction. Use good magazines and keep them clean. I have been using Magpul P mags and I think they function great. Use good ammo as well. One of my rifles has had well over 5000 rounds through it, and it still runs great. At least it did until I lost it and all of my other weapons in that tragic boating accident.
Thanks. Good info and advice.
Tragic boating accident. Let me guess, you were duck hunting in your canoe....