Guns Modify Aluminium CNC Zero Housing System for Tokyo Marui Model 17 / 26 / 34
CNC Aluminium Construction
More durable when using harder hammer spring and accommodates zero hammers with no problem
Design for Replace The Original Blowback Housing
Suitable for Tokyo Marui G17/26/34/22 Series Airsoft Gas Blow Black GBB Pistol

As always, upgrading GBB require necessary skill & technique, consult expertise if needed