+1 for DI. I have a Bushmaster ORC with about 1,00 rounds and it has never failed. There are things you can add to your AR to make it more reliable. Start with a quality manufacturer like Colt, Bravo Company or Spikes Tactical. Get a mid-length gas system. Add a SpringCo blue buffer spring, a BCM extractor spring with back insert and O-ring. I like the McFarland one piece gas ring. Use Magpul PMags. If you want the max in reliability get the FailZero bolt carrier group with hammer. Some think a heavy buffer adds to reliability, I have a Spikes Tactical ST-T2 in my AR. Furniture and optics of choice, mine is Magpul MOE and Aimpoint H-1 micro.