.52 caliber. 32.625" round barrel secured by three pin-retained flat bands. NSN. Browned and color casehardened finish, iron furniture, smooth walnut stock. Single-shot, breechloading percussion altered rifle with Hall's patent tilting breech block, offset notch rear sight, offset combination front sight and socket bayonet lug, sling swivels and a button head cleaning and clearing rod. Top of breech block marked in four lines: J.H. HALL/H. FERRY/US/1832. Action altered to percussion by an unknown Federal contractor circa 1861. This is clearly the standard Northern alteration to percussion and not one of the more exotic Confederate alterations. A nice example of the first US military arm to be produced at a national armory on the principle of interchangeable parts, altered to percussion from flint to extend the service life of the rifle and likely held in reserve for issue at the outbreak of the Civil War. {ANTIQUE}