cracked my red dot open today for the first time. it runs great but time for some maint.
i notice that i have a burnt brownish residue inside the button head and the head of the piston has this also. along with what may be the begining of pitting. it doesnt seem to be in the metal, just ontop where it should be brown there are some specs of clean metal.
the rod is going in tomorrow, i have heard of something that can be done to brighten the piston head back up, does anyone know?