A trigger retention mechanism for a device that includes a depressible trigger and a bushing releasably coupled to a housing by a releasable fastener, such as an E-clip. The retention mechanism can also include O-rings to provide an air-tight seal between the bushing and the housing. To replace the retention mechanism, a user need only release the fastener and pull the bushing outwardly from its position within the housing, rather than replacing the entire handle or trigger assembly.