An improved firearm system is provided. The improved firearm system comprises an improved firearm cartridge for use in firearm designed to fire the improved firearm cartridge. The firearm cartridge comprises a projectile substantially seated within a cartridge casing, which reduces the length of the firearm cartridge. The cartridge casing may be modified to accept more than one primer. A firing pin of the firearm may be modified so it may strike each of the primers of the cartridge casing. A bolt body may be modified so that it has two pieces connected by a pin so that it may house the modified firing pin. Because the length of the firearm cartridge is reduced, the length of a magazine that holds firearm cartridges may also be reduced. This allows a handle of the firearm to be moved forward so that the magazine may be inserted through the handle.