The J P Enterprises JPSCS2/VMOS Replacement O-Rings with Spacer Shim provides essential maintenance components for your firearm system in a convenient 12-pack configuration.J P Enterprises JPSCS2/VMOS Replacement O-Rings with Spacer ShimCompatible with JPSCS2 and VMOS systemsIncludes both O-rings and spacer shim components12-piece pack for multiple replacements or repairsOEM replacement parts for reliable performanceEssential for maintaining optimal function and seal integrity in your J P Enterprises JPSCS2 or VMOS system ensuring continued reliable operation.