Remington O-Ring Barrel Seals Kit for 1100 20 Gauge 11-87 20 GA of All Models STD/LT/LW/SP This is the one you have been hunting for. Manufactured, tested, packaged & sold in the U.S.A. by Mallard Armory. This kit includes two seals with one guaranteed to fit All Remington 1100 & 11-87 20 Gauge STD/LT/LW/SP models. High-grade synthetic rubber O-rings replace old, worn, or cracked rings to provide a proper seal and restore gas system reliability. Resolve blow back issues with 20 gauge gas ports. Will resist many solvents used to clean firearms. Material has a high tolerance to compression and operational at an extreme heat of 316C(600F) down to a freezing -54C(-65F).