How hard is it to add ghost rings to a mossy 500? Anyone recommend a good aftermarket set up? I have an ancient 500 (It's actually labeled a Western Field but we all know its a mossy) there are no screw taps on the receiver but I can drill a couple of holes in aluminum. The issue is how to set up the front sight. Anyone have a suggestion for a kit/setup. Does anyone make a barrel with the front sight pre-installed? Is it just cheaper and easier to buy a 590? Or, would it be better to mount a scope rail on the receiver and install a red dot? Thanks for your help.