The final production version of the Hall was Simeon North’s Model 1843 Carbine, of which 10,500 were made between 1844 and 1853. It used North’s percussion update to the design, and a cleverly simple calming lug connected to a lever on the right side of the action to open the breech. These were smoothbore .54 caliber guns, issued to the Dragoons and used in the Mexican-American War.