Benelli Mercury Recoil Reducer and Bracket. The Benelli Recoil Reducer is a mercury-filled device that fits inside the buttstock of the Benelli 12ga. Nova pump-action shotgun. Weighing only 14 ounces, the Benelli Recoil Reducer is easily installed with the use of the Recoil Reducer Bracket, which fits into the recess in the Nova's buttstock. When shooting heavy loads like the 3 1/2 inch magnums, this system is a welcome addition.