WA Beretta M84F [Non-R Type] Blowback Valve O-ring

O-ring set for the release valve of the Beretta M84F steel press exterior, non-R type magazine (4 pieces + 1 spare).

■ Set contents have been changed (2025.08)
The O-rings for the valve (front) are now offered in two types: Type A (hardness 70, softer) and Type B (hardness 90, harder).
If you still experience slight leakage (a faint hissing sound) even after replacing the O-ring with Type A, using the Type B O-ring may resolve the issue.
Please note that installing the Type B O-ring is quite stiff. Be careful not to stretch or damage it with tools.
Warming it with your hands and gently massaging it should make it possible to install by hand.

*For the M84FS Cheetah (R type), please purchase the WA Set C Release Valve O-ring.

■ About non-R type valves
Non-R type valves are prone to leakage from the rear of the valve.
Minor leaks can be resolved with oil application, but please consider them consumables to some extent.

The O-ring at the rear of the valve maintains airtightness by pressing against the sleeve due to internal pressure.
Therefore, if you inject raw gas into an empty magazine, the O-ring will rapidly cool and harden, making it difficult to stop leaks.
For a cold magazine, try warming it slightly (to soften the O-ring), then inject vaporized gas while holding it upright, and observe.
If there are no leaks, proceed with injecting gas upside down as usual.

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Airsoft Gas Blowback Packing Gas Gun
Maintenance
Western Arms BERETTA M84F