Overall length 57.75"; barrel length 42"; caliber .69. Markings: on lock forward of hammer, "US/DERINGER/PHILADELA". Just as original percussion rifle appears to be an altered arm, the rare Deringer rifle muskets at first appear to have been flintlocks. However, these arms are original percussion, having been made from spare or rejected parts from the U.S. M1816 muskets. Brazed bolsters are identical in style to that of Type II original percussion rifles made by Deringer. Barrels are rifled with seven grooves and barrels accordingly bear a rear sight. Deringer probably assembled a hundred of these rifles in 1861 to arm some company of Pennsylvania's early war regiments.