AKA Steel Hammer Set for Marui G17 GBB 
Steel Construction 
Suitable for Tokyo Marui G17 Series Gas Blow Back Rifle 

Package Include Steel Valve Knocker, Steel Hammer Sear, Steel Hammer with 8mm Bearing, Valve Knocker Spring, Hammer Sear Spring, Hammer Spring
SKU    AKA-015-MG17
UPC    N/A
Item Weight (gram)    18
Major Color    Black
Built Material    Steel
Manufacturer    AKA
Disclaimer    As always, upgrading Airsoft Gun require necessary skill & technique to dissemble the gun, consult expertise if needed