Guns Modify Stainless Steel Gas Block for M4 Airsoft GBB Rifle (Silver)

Guns Modify Stainless Steel Gas Block for M4 Airsoft GBB Rifle (Silver) Stainless Steel Construction Design For Upgrade the Original Parts Work With Standard Mock Gas Tubes (Not Included) Suitable For Tokyo Marui M4 Gas Blow Back GBB Rifle Airsoft Guns