A question always asked by airsoft players is replacing the Hop-Up bucking. So it's better for you to bookmark this video made by Airsoftjunkiez.com showing you how to do it... "Detailed video of a commonly asked everyday question, "how do I replace a bucking?" A torn bucking will give you feeding or jamming issues and inconsistencies. Always inspect your hop-up and bucking if you are having feeding issues."