Ok I used this as a beginner gun because I started playing paintball. At first I was using Zap paintballs they were ok, broke a few balls. But once i decided to use Brass eagle Rec balls i think....anyway they haven't broke on me once. anyway i took the whole thing apart oiled it and sanded the bolt. Now it works fine.
Its a good little gun. i would recommend this gun to someone just starting out.