Guarder Steel Valve Knocker for Marui/KJ Glock GBB Series L MK modification may need for installing

modification may need for installing this kit on the other brand M4 GBB Series

As the pellet shoots through this hop up bucking

The barrel is made out of Aluminium and brushed to make it look like steel

Length 680mm / 755mm (Extended)

inner organizer for smaller objects and tools

Guarder Steel Valve Knocker for Marui/KJ Glock GBB Series L MK modification may need for installingGuarder Steel Valve Knocker Replace the standard valve knocker of airsoft pistol magazine Steel Construction Design for Tokyo Marui G17, G18C, G26 KJ Works G23 G27 Series Airsoft Gas Blow Back GBB Pistol As always, upgrading GBB require necessary skill & technique, consult expertise if needed SKU G GLOCK 50 Item Weight (gram) 5 Major Color Silver Built Material Steel Manufacturer Guarder