Flintlock
Springfield Model 1795 Musket - patterned after the French Charleville musket, was the first U.S. flintlock musket to be produced at the Springfield Armory. Designed by Eli Whitney it was the first gun to use interchangeable parts.  Also produced at the Harpers Ferry Armory, about 10,000 were delivered to the US Army for use in the War of 1812.