Harper's Ferry Armory's production of the first standardized US military musket, based on the French Charleville M1777. Harper's Ferry and Springfield Armory shared production. The first musket manufactured by the fledgling US government for its own army. Type: Musket Action: Flintlock Caliber: .69 cal Capacity: 1 Year introduced: 1795, USA Weight: 128 oz Overall length: 54" Status: Discontinued Military use: Yes Intended use: military