new barrel is not needed, but would be a good idea.
maybe some better grips
Cheap and reliable
doesn't chop balls
Screws/bolts not tight
not accurate at further distances
Ok, well, for a beginner gun, this one is great.
*If you don't use crappy balls, they will not get chopped. I played a 24hr scenario game and even using crappy "ZAP" field paint, I only broke like half a dozen out of 4-500 balls. I've never chopped the Blue-Streak you get at Wal-Mart
*Large Expansion chamber and low-pressure chamber ensure that broken balls will not be caused by frozen CO2 crystals in your gun.
*Maintenance is easy and convenient with essential o-rings being bottle o-rings.
*The Regulator leaked as soon as I hooked up my CO2. Dave at bargainpaintball sent another to me that worked perfectly, though. (kind of slow about getting it to me though - btw, I'm not in any way affiliated with Dave or BPB dot com)
For a beginner gun, you cant go wrong for the price. All the extra features and performance kick butt at $150. *Looks cool too.