GHK 551 Conversion Kit for GHK 553 GBB Rifle

GHK 551 Conversion Kit for GHK 553 GBB Rifle High Quility Steel and Aluminum Construction Include RIS 20mm Rail Handguard, Steel Outer Barrel, Inner Barrel & Flash Hider Suitable For GHK 553/ GHK 553 QPQ Series Airsoft Gas Blow Back GBB Rifle