Introduced in 1965. Chambered for 444 Marlin. Essentially a Model 336 action modified to accept larger cartridges. It has a 24" round barrel that was cut back to 22" in 1971. Holds five shots. When introduced, featured straight-grip Monte Carlo stock and semi-beavertail forend with barrel band. Another band holds the two-thirds-length magazine tube in place. In 1971 stock was changed to a pistol grip without the Monte Carlo comb.