As the gun reciprocates back and forth hundreds of times per minute, the rubber grommet allows a little cushion. So it is a piece that could wear out depending on usage. In case that happens, you can simply change the rubber grommets as shown in the video below.
Note: Each HappyGun kit has free extra rubber grommets for future use.
Please note: ALWAYS make sure that the rubber grommet is placed correctly every time you will use your unit as this may cause malfunction. If that's the case, this will fall under the category "improper use". Malfunction or damage of an operating part caused by failure to follow Happygun's recommended maintenance or usage is not covered under HappyGun's warranty and return policy.