I swapped the parts between my 336SS and 1895GS without a hitch. Seems some newer 336 levers already have the groove cut into them. Makes sense in a production setting as the manufacturer can stock one less part that way.picketpin said:Rob, yes the 1895 lever will fit and work in a 336 , of course you will need the bottom metal also(trigger plate) to complete the straight stock conversion. The switch will not go the other way without cutting a groove in the lever for the 45-70 loading gate to sit down in.