When I had my 52, I got these glow in the dark stickers. I don't remember which online store they were from, but they were originally for a watch company. It consisted of a few little circles (for the rear sight), and then some straight strips. You put some crazy glue (which even came with a bottle) on the back, attach them to the gun, and then let them dry. You could then go in with an exacto knife and do any trimming that you want (not necessary on the dots, but it made the strip flush with the front sight). Then, after it was trimmed, put more crazy glue on top to seal it. It was cheap, and actually worked really well.