Too many to list...
1.The bolt jams constantly while shooting fast
2. The barrel breaks paint like crazy and ive tried different paint it breaks no matter what kind.
3. The accuracy is horrid no matter what paint you use
4. So much kick everything on the gun comes loose, so you have to constantly tighten screws between games
Unless you want a fast shooting loud as hell gun, do not buy this gun. Its very crappy performance, and it just plain sucks overall. Save $70 and get a spyder compact, it shoots better then this gun can ever shoot.
ok for one thing a spyder compact sucks way more ass this gun is super fast and if you buy a highly accurate and quite barrel with a good electro hopper then it will be a good gun and if bolt jams alot buy a better one or if barrel breaks alot of balls try different ones and paint shouldnt affect the accuracy also every gun is different and you probably dont have to constantly tighten screws ( the one i used didnt) so if i were you i wopuld take up a different sport cause obviously this one isnt for you.