A genuine FX Airguns replacement O-ring for FX PCP air rifles, measuring 4mm internal diameter by 1.5mm cross-section and manufactured from nitrile rubber (NBR) at 70 Shore A hardness. The 70 Shore A rating gives this seal a softer, more compliant feel than harder-grade variants, allowing it to bed in and conform slightly to mating surfaces — a characteristic well suited to lower-pressure sealing positions. The FX position reference codes C33 and C35 are printed on FX rifle service diagrams, so you can cross-reference the seal position precisely before ordering. Nitrile rubber offers good compatibility with the compressed air and light lubricants used in PCP rifle maintenance. Supplied as a genuine FX Airguns part, this is the exact specification required for those positions — not an aftermarket equivalent. Keep one as a bench spare so a failed seal need not interrupt a planned outing.
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