Only a small number of the Jennings rifles were manufactured by Robbins and Lawrence in 1848-1852. The Jennings rifles mark the important second step in the evolution of what eventually became the Volcanic, Henry, and Winchester lever actions. Work on the Jennings rifles at Robbins and Lawrence is credited with bringing together B. Tyler Henry, Horace Smith, and Daniel Wesson under the same roof and thus helped lead to both what became the highly successful Winchester lever action series and the iconic Smith & Wesson partnership. Beginning in 1852, Robbins and Lawrence abandoned the underpowered rocket ball cartridge in favor of building muzzle loading variants. Many of the original breech loaders were altered by outside gunsmiths into muzzle loaders as well. It still has the round pill primer on top and a rectangular loading cut out. The ring trigger that originally pushed the breechblock into place and operated the automatic pill primer on the breech loading versions now functions simply as a trigger for the hammer. The only visible markings are an "H" on the left side of the hammer, "6 71" on the lower tang, and a scroll engraved plate on the left side of the stock. It has fixed blade and notch sights, a smooth straight wrist stock, and a rifle buttplate.

Fair with a dark brown coating of protective lacquer, mild scratches and dings, tool marks and edge wear mainly at the breech end of the barrel, and mild oxidation and pitting on the metal. Repaired wrist, light surface scratches and dings, and dark re-oiled finish on the stock. Mechanically good.