The Ultimate Nerf Vulcan Mod

Step 5 Add the Counter House

We took the top of the ammo box off and used it to house the counter. Dremel out the spot for the LED counter out. We dremeled part of the chain-gripping assembly to mount the roller switch. This way the links would hit the switch each time the belt advanced. The leads from that switch go to the counter through holes Dremeled in the top of the chain guide.