I'll try to explain #1 problem better. All aspects of the RC operate as they should, the tanks drives, steers, fires machine gun, makes main gun jumpback when I press the "K" button. There is a switch in the hatch in the turret. Its the hatch where you add the bb's. It has on and off. If I switch it on, the main gun just starts firing. About one shot every second or so until the bullets run out. Then it still keeps popping.

The RC transmitter's left stick seems to function fine. It will move the turret up and down. In fact, if I pull the left stick down, the gun elevation cycles up and down, all the while the gun keeps firing.

I'd hate to pay $25 shipping to return the tank for something I am doing wrong or could fix. I'd rather put that $25 towards a repair or upgrade to a hobby radio interface board.