Originally Posted by Hair Trigger

That's the K22 Masterpiece Magnum Rimfire, Model 48, 3rd engineering change (dash-3). The dash-3 was made between 1967 and 1977, yours was made sometime after 1968, because your stocks do not have the diamond around the screw that holds the stocks (grips) in place. The Model 48 was discontinued in 1986. One in excellent condition is worth about $1100, VGC will bring $700+. I have a M48-4, made in 1981.

Edit: you said YOU threw some magnas on it; what did it have on it when you got it?