GBB Exhaust Valve Shim Set | Poseidon

Poseidon GBB Exhaust Valve Shim Set – this accessory for optimal gas regulation

The Poseidon GBB Exhaust Valve Shim Set is a technical upgrade for GBB guns that allows precise adjustment of gas output and FPS. This set contains shims in various thicknesses made of stainless steel, designed to be placed between the exhaust valve and valve knocker. The result is better control over the amount of gas per shot, which directly affects the muzzle velocity and consistency of your GBB pistol or rifle.

Technical features and compatibility

This shim set is manufactured from high-quality stainless steel for long-lasting performance. The red finish makes the shims highly visible during installation. The platform is widely applicable: the set fits GBB systems from WE, KWA, Tokyo Marui, and VFC. The different thicknesses allow you to set the exact desired gas flow, which is especially important in varying temperatures to which GBB guns are sensitive.

Practical use

You place these exhaust valve shims between the valve and knocker in the magazine or bolt carrier group. By using thicker shims, you increase the distance the valve travels, releasing more gas and raising the FPS. Thinner shims result in less gas release. This makes it possible to tune your gun to field limits or achieve more consistent performance with different gas types – from Green Gas to stronger Red or Black Gas at lower temperatures.

Ready to add the Poseidon GBB Exhaust Valve Shim Set to your loadout?