I am very surprised no one has mentioned Mercury Recoil suppressors. I have put them into competition shotguns as well as heavy and sharp recoiling rifles like the 7 RUM that I don't want to have a brake on for hunting. They make a tremendous difference. Have one of these installed in the stock of your gun, a good Pachmeyer Decelerator or Limbsaver recoil pad, lengthen the forcing cones and port the barrel and your 12 gauge will shoot like at 410. Do those things to a good gas operated gun and you will have the softest recoiling gun you will be able to find, but even on an O/U it will make a huge difference..
MERCURY RECOIL SUPPRESSORS, SUPPRESSORS THAT USE MERCURY, RECOIL REDUCTION, REDUCE RECOIL IN SHOTGUNS AND RIFLES
MERCURY RECOIL SUPPRESSORS, SUPPRESSORS THAT USE MERCURY, RECOIL REDUCTION, REDUCE RECOIL IN SHOTGUNS AND RIFLES
www.mercuryrecoil.com