This gun sux. The gun is too bulky and heavy. The single trigger makes it horrible to shoot fast. The gun shoots about 1 ball per second and at the end of your CO2 it chopps about ten ball at the same time. This gun has no sight rail and where the CO2 is located it serves as a horrible grip. The CO2 is cold and enables you to aim badly. The barrel is a pain in the neck and to change the velocity you literally have to yank the allen wrench.
If you are seeking upgrades on this gun, don't bother. Pawn this gun in and get a Genesis. It's the exact oppsite of this gun. I'd recomend this gun to people who want to get shot. The cost is semi-reasonable but it's worth about half of it.