2100.00 Antique Harpers Ferry U.S. Model 1842 Musket Calgary Mar 24, 2024 - 8:49 PM antiques only This is an Antique Harpers Ferry U.S. Model 1842 Smoothbore Percussion Musket. The overall length is 57-3/4” with a 42” long barrel and coming in at just under 10 pounds. This is a .69 caliber musket.