Definitions for "GBB"
Keywords:  airsoft, pistol, gun, bowback, recoil
Acronym for Gas Bowback
Gas Blow-Back. This term describes gas powered Airsoft guns that utilize a charge not only to fire the BB but to cycle the action so as to mimic the operation of a real firearm.
Gas Blow-Back. Weapon (usually a pistol) that uses compressed air to fire bb's and cycle the slide, simulating recoil.