US Patent 7891282 Booster for handgun silencers

A booster apparatus that is to be used with an autoloading handgun is provided. The proposed novel device utilizes a piston with five spokes which are secured against rotational movement by interfacing with five of ten indexing notches that are machined on the stopping flange of the booster housing. There are ten indexing notches provided which allows for ten positions of orientation for the silencer in relation to the bore of the host firearm. Unnecessary rotational movement is prevented by the indexing notches which are robust and secure the piston in place. This device when utilized with a handgun silencer will facilitate the proper semi automatic function of the host firearm.