Introduced in 1910 and manufactured until 1932. A sliding button on right side of receiver permits the gun to be opened while a cartridge is in the chamber. Dovetailed beaded blade front and elevation adjustable rear sights, standard Marlin markings, 9 groove forearm and smooth straight grip stock. The left side and top of the receiver and upper tang are factory tapped for sight/scope mounting. Chambered for the .25-20 Marlin cartridge that Marlin first introduced on their Model 1894 rifles. The serial number is marked on the left side of the lower tang, stock tang cut-out and back of the buttplate.