I'm totally new to the "AR" world, and I'm thinking about buying a "like new,shot very little" (so the guy says) DPMS A3/M4. Any issues with quality and or reliability with DPMS rifles? Any particular things to look for when I see the rifle in person? LIke I said, I'm new to AR15s so any advice will be helpful. Thanks. Wanna kill these ads? We can help!