McMillan Group International, located in Phoenix, Arizona, is the corporate parent for a family of firearms companies committed to excellence in the firearms industry. Companies include McMillan Fiberglass Stocks, a leading manufacturer of premium custom fiberglass stocks for hunting, competition, tactical and OEM markets; McMillan Firearms Manufacturing, a manufacturer of the McMillan tactical and hunting rifles; McMillan Machine Company (formerly "McBros"), a contract manufacturer of precision machined parts and McMillan Operator Development, an advanced tactical training school for military and law enforcement.