This kit upgrades your Revolution loader to a sound activated loader. What's the deal with a sound activated loader An optical sensing loader 'prevents' misfeeds while with the Reloader they simply don't happen. While an optical loader basically acts like a regular gravity fed loader until it senses a misfeed and then rotates the paddle, the Reloader never waits for a misfeed to happen. Instead it loads a ball every time the marker is fired. Kinda make ya wonder how you ever lived without it!