Hi

Don't bother with the Gamo target box, i had one and it soon stopped working.
They have plastic spacers in the top part of the box and as soon as a pellet hits these they break then everything starts to go downhill from there on.
I replaced mine with metal ones, that cured that problem but then the spring type part that connects to the middle resetter got bent and everything kept jamming up.
It soon found its way into the dustbin.
I would just get a spinner type target if i were you, less parts to go wrong.