The KWA E-12 Main Seal fits most KWA GBB pistols, as well as a few SMGs. Occasional replacement helps restore compression and FPS. On respective diagrams, this part appears as M11A1 NS2 part 130, M226 part 36, M1911 MK Series and M1911A1 part 86, kz.75 part 30, M1911DS part 125, and kz.61 Skorpion part 113.