well i tried the silicon lube, i put a bb in the turret, shot it at the wall, and it worked great, its just when i put more than 1 bb in the turret, thats when i have troubles.

i just had little look inside the turret, and there are two pieces that keep barrel in line with the firing system, and they are both broken, which is leading to the barrel being able to side to side a fair bit, which could be putting the firing system out of line causing the bbs to get stuck, now just a matter of fixing it....