A firearm sound suppressor (50) includes a housing (52) including a front end (54) and a rear end (58). The rear end (58) includes a flange that partially encloses the rear end and defines a rear aperture (60). The firearm sound suppressor (50) also includes a back end member disposed substantially within the rear end of the housing and including a rear surface (64) disposed in abutment with an inner surface (66) of the flange to prevent the back end member from passing through the rear aperture (60).