Don’t get caught short or let a broken shotgun ruin your hunt. Convenient, pre-packaged kits contain the parts most often required for emergency, field repairs. All parts are Remington, Mossberg and Winchester Factory, tagged with the Brownells stock number, and current factory parts number. Two barrel seals, one piston and one piston seal. Fits all 12 gauge, plus large-frame 16/20 gauge guns with X or N in serial number.