So the gun only weighs 0.2g? :P
Anyway, The gun is rediculously sensitive to BB weight, and i've found that .25g bb's are simply the best to use. The gun shoots accurately about 60ft until the bb's spread out in wacky directions. However, my 'top barrel' often shoots a lot farther than the other two below it. The hopup, fixed, works quite well in this sense, and if you take the time to aim with it, its not too hard to hit a target at the distance.