The Harper's Ferry Armory M1803 Harpers Ferry Rifle is a usa-made flintlock rifle chambered in .54 cal, introduced in 1803. Primary use: collector. Type: Rifle Action: Flintlock Caliber: .54 cal Capacity: 1 Year introduced: 1803, USA Weight: 104 oz Overall length: 43.5" Status: Discontinued Military use: Yes Intended use: collector