On top of the tang on my Drilling is a selector switch that raises the leaf sight on top of the rib when you want to shoot the rifle. You press a button down and move the selector forward or backwards. There is an "S" at the forwad end of the selector that is covered when the leaf sight is raised and a "K" that shows at the rear of the selector. The "K" is covered when the leaf sight is lowered. Can anyone tell me what the "S" and the "K" stand for? Thought it was a safety but the safety is located on the side and is marked "S" and "F" like one would expect.