thanks guys, Its intersting, but correctly I was thinking in a system thats feed my hopper until I consume the paintballs. The extra bigger hopper 450 balls is to big and probably to heavy to take in a marker, and obviously it will easily see for the enemy, I will review the link for the turtle system, Im thinking in something works with gravity or a little vent system that impulse the balls through a tube that is connect to the hopper, and refeeding in equilibration of the number that I consume. thanks a lot for your help