I made this out of wanting to get into paintball, but my parents won't let me, even though I'm 15. Anyways, the rate of fire of paintball marker is measured in bps, or balls per second, which is how many paintballs can be fired in one second. To fire, players rapidly tap both fingers alternatively on the trigger to fire at fast rates of fire. This is known as "walking the trigger." To play: The down and left arrow keys are the trigger buttons. alternatively press them and see how high of a bps rate you can get! my record is 12, try and beat it! The marker pictured is a Spyder Pilot ACS. And yes, I know that it doesn't have a hopper. I'll add that when I feel like photoshopping one on :)