The purpose of the delayer is to keep HopUp chamber open for a longer time. It is mounted on the piston gear. It fit without gluing or fasten. Just press it between pin and axle. This small device could solve your problems with the bullets feeding. For exmaple on HROF guns. Before instalation remove brass ring, which is on the piston gear. If this ring is part of the axle, this cam cannot be used.