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Valve-nest for Tokyo Marui M870 shotguns
© GBB Hungary

Valve-nest for Tokyo Marui M870 shotguns

This is our BST valve-nest for Tokyo Marui M870. The stock valve-nest isn't seal properly so we redesigned it with a lot nice and nice function.


- New sealing design. The valve-nest has much better and bigger contact are which cause better sealing even with HPA.

- It has a spring guide for the hammer spring.

- Made from copper by hand-working. The size is perfect, we spent a lot energy to reach the best design - this is the third version.


The third version tested with HPA, it is run 7 month without any leaking in TM Breacher.


© GBB Hungary
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