An 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 operate the blowback system. Some electric airsoft guns also feature blowback units, in which case the blowback is usually powered by a small electric motor.
In addition to providing a more realistic shooting experience, blowback units can also add an additional level of mechanical complexity to an airsoft gun, which can make them more interesting to enthusiasts who enjoy tinkering with their guns. However, blowback units can also increase the cost and maintenance requirements of an airsoft gun, so they may not be ideal for everyone.

5KU CNC Aluminum Type 2 Lightweight BBU Blowback Unit For Action Army AAP 01 GBB Airsoft (Silver)
CNC Aluminum Construction Airsoft Blow Back Unit
Stylish Blue Finish that adds a Touch of Personality to your Gear
Design For Improved Blowback Action of Your Airsoft Pistol
Suitable For Action Army AAP 01 Gas Blow Back GBB Airsoft Pistol