It is only compatible with the Vulcan EBF-25. There are two major types of the belt. One has two grey 'blank' pieces on either side of it; it can be modified to attach other belts to hold more darts. The other, newer release of the belt has only one green "blank" on the right side of the belt; because it lacks a second blank at the end, one cannot easily connect two belts of this type without sacrificing the last chamber/cartridge in the first belt.