Only 100 each of the Model 1842 muskets, Model 1841 "Mississippi" rifles, and Model 1847 cavalry musketoons were reportedly converted using James H. Merrill's breech loading system c. 1861-1862. These Merrill breech loading alterations of the Model 1842 muskets are described on pages 201-203 of George D. Moller's book "American Military Shoulder Arms Volume III." The alteration was performed by replacing the breech plug and tang with the Merrill breech system as well as adding the lever catch to the barrel, adding an additional screw in the lock plate, and installing a clean out screw on the bolster. The barrel was also rifled and fitted with a long range rear sight. This rare Merrill alteration is not to be confused with the much more common Merrill manufactured carbines and rifles also used by the Union during the war effort. The front sight is an integral blade on the front barrel band. A stud on the bottom at the muzzle is used for socket bayonet mounting. The barrel is marked with "PB/P" and "V/P/eagle head" on the left near the breech. The lock plate is dated 1853 and has the standard markings. The breech mechanism is marked with the Merrill address and patent information in three lines. The standard musket stock is marked with a circled script "JAS" (John A. Schaeffer) cartouche on the left stock flat. Includes a US socket bayonet.

Very good with a mix of silver gray patina and darker gray-brown patina throughout, some minor pitting, distinct markings, darker brown patina and oxidation on the buttplate, and general mild overall wear. The stock is also very good and has some small chips, dents, and scratches associated with actual field use and has a lightly worn but legible cartouche. Mechanically excellent. The bayonet is also very good with gray and brown patina and mild oxidation. This is a rare example of a Merrill altered U.S. Harpers Ferry Model 1842 rifled musket! We very rarely get a chance to offer one of these rare breech loading conversion, and they are missing from even most of the more extensive U.S. Military arms collections. Don't miss your chance!