Designed by Gilbert Smith, the production of this breech loading percussion carbine was almost entirely consumed by government contracts, with limited numbers going to the civilian market. Standard three sets of markings on the left side of the frame "MANUFACTURED BY / AM'N M'CH'N. WKS / SPRINGFIELD MASS", agents' names "ADDRESS / POULTNEY & TRIMBLE / BALTIMORE U.S.A." and "SMITH'S PATENT / JUNE 23, 1857". Dovetail front sight and folding leaf rear sight absent of yard markings. Breech loading action with barrel release latch inside the trigger guard, freeing the barrel to pivot downward. Casehardened hammer and action with smooth straight grip walnut stock with a steel buttplate.