The first US percussion rifle adopted for general service. Earned its nickname from Jefferson Davis's Mississippi Rifles regiment at Buena Vista. Many were later re-chambered to .58 during the Civil War. Features a distinctive brass patchbox in the buttstock. Type: Rifle Action: Percussion Caliber: .54 cal Capacity: 1 Year introduced: 1841, USA Weight: 104 oz Overall length: 43.5" Status: Discontinued Military use: Yes Intended use: military