The least needed "improvement" that you can do to a gun. Does not reduce recoil. Minor reduction in muzzle jump is very over rated, the second shot is always on a rising bird so muzzle jump is not a big problem. Noise increase will make you less popular than a dog that rolled in ----, in a small blind. Does not improve pattern. Just a waste of time and money. Almost a sin to do on any gun IMHO and certainly is a sin to do it to a double, even a Winchester 21.