Samoon Stainless Steel Bolt Lock Spring For GHK M4 GBB Airsoft Rifle

Samoon Stainless Steel Bolt Lock Spring For GHK M4 GBB Airsoft Rifle Stainless Steel Construction Airsoft Spring Design For Upgrade the Original Airsoft Internal Parts More Durable Suitable For GHK M4 Gas Blow Back GBB Rifle Airsoft Gun