An extraction system for extracting a cartridge from a firing chamber of a firearm includes an extractor mounted within the firearm bolt which has a bolt head with a plurality of lugs proximate a bolt face, a cartridge recess extending axially inward from the bolt face, and an extractor aperture extending radially outward through one of the lugs. , such as nickel silicides, that are formed after completion of a silicide blocking layer. Once signed, the electronic group message can be provided to one or more recipients. The main portions are insulated from each other. The community of devices over which a search is performed can include devices that are not publicly accessible, and that require the provision of authentication information.