The Model 342S was effectively an upgraded Model 342 and was manufactured between 1950 and 1955.
As per the Model 342, the Model 342S was only available in 22 Hornet.
Upgrades included a hooded Dockendorff front site with an adjustable Dockendorff rear sight. Also included the rear peep sight. The Model 342S included sling swivels as well as a checkered butt and forestock.
Note: this rifle has the flat magazine trigger guard.