how do i make a led counter?

send a instructable or other on how to make a LED counter. not a kit but take a calculator screen (just a example) and make it so when i press a switch it it counts up one (or down one) i want to take a nerf machine gun and it counts the "bullets" as they pass and have a reset button to send it back to zero.THANKS -kieran

Use a few CD4033 chips and 7 segment LED units. Or this, using the 40110