Classic army Px 9 X9 with drum mag.

Spares and repairs. For the life of me, I cannot get this thing to shoot straight. Don’t have the time, or effort for Airsoft anymore. I’m sure it’s just a bucking or maybe needs a new hopper. Motor was replaced and gearbox is all good. Drum mag included which also works as intended. Could be a bargain and easy fix for someone with know how.