in a semi automatic marker, the bolt is pulled back and it stays back, when you pull the trigger the bolt is released, then gas pushes it back, by then a spring has to move a piece up to cach the bolt, so only one ball per trigger pull. how can i make it so when as long as i have the triger held down it keeps shooting. how can i do this so my marker is selective. i have a spyder sonix
and a light wallet
and a light wallet