J P Enterprises Jpscs2/Vmos Replacement O-Rings With Spacer Shim
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J P Enterprises Jpscs2/Vmos Replacement O-Rings With Spacer Shim, These O-rings will replace any worn, deformed or lost rings from any JP Silent Captured Spring or Variable Mass Operating System (VMOS) bolt carrier. Replacement of O-rings should take place when you start to see fraying or cracking of the rings. This will happen sooner in the case of 9mm carbines, around 5000 rounds. Mfg: J P Enterprises