Shotgun Barrel Seals for Remington 1100 or 11-87 12ga, O-ring 3 pack Made in the USA, high quality replacement o-rings for Remington part number F15899 Fits Remington models 1100 and 11-87 12 gauge shotguns. Also compatible with 16GA and standard 20GA **Does NOT fit 20GA LT or LW models** Corrects shell cycling malfunctions due to gas leaks from worn or damaged orings Chemical-resistant fluoroelastomer, 75A durometer Item packaged in resealable 3x4 plastic bag