I have a Nova 20ga and was able to eliminate 98% of it. Take a piece of sticky back velcro(fuzzy side) 3/4" wide long enough to come to w/in 1/4" of the top edge of the forearm on both sides. Remove the forearm and put the velcro in a U shape right at the inside back edge. Replace forearm and tighten the two hex head screws just a little. Walla.....no more rattle.