5KU CNC Aluminum Type 2 Lightweight BBU Blowback Unit For Action Army AAP 01 GBB Airsoft (Blue) Inner-Barrel-Length-(mm)_133 Come With 60 Degree Hop

Come With 60 Degree Hop Up Chamber Set

Suitable for G&P M4 AEG/ TM Spec M4 AEG/ M203 Launcher

Suitable For Tokyo Marui & Umarex (VFC) G Sereis Airsoft Gun Gas Blow Back GBB Pistol

CNC 6061 Aluminum Construction (hard black anodize finish)

5KU CNC Aluminum Type 2 Lightweight BBU Blowback Unit For Action Army AAP 01 GBB Airsoft (Blue) Inner-Barrel-Length-(mm)_133 Come With 60 Degree HopAn airsoft blowback unit is a mechanical system that simulates the recoil of a firearm in an airsoft gun. When a BB is fired, the blowback unit uses some of the air pressure generated by the shot to move a portion of the gun's slide or bolt back and forth, creating a recoil effect that mimics the action of a real firearm. Blowback units are most commonly found in gas powered airsoft guns, where the expanding gas is used to both propel the BB and