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.This pack of 12 O-rings also includes one spacer shim for the JPSCS to achieve proper fitment and a replacement retaining screw.
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Product Focus: AR-15/AR-10 Silent Captured Springs
The Silent Captured Spring is one of the most revolutionary an…
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Installation/Reconfiguration | Silent Captured Springs
Unlike any other part we’ve made, the Silent Captured Spring h…
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9mm PCC Maintenance Kits – New Product Showcase – MARCH 2018
Two is one, and one is none. If you don’t have spare parts for…
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