GBB

GBB (Gas Blowback) is a type of gas-powered airsoft gun that simulates real firearm recoil by cycling the slide with each shot.

What is GBB

GBB guns use compressed gas (Green Gas or CO2) to fire a BB and move the slide backward at the same time. This mechanism creates a realistic shooting feel similar to real firearms.

Key features of GBB:

• Moving slide with each shot
• Realistic recoil
• Magazine holds both gas and ammunition
• Slide lock function on an empty magazine

Types of propellant gas

GBB guns use two main types of gas:

Green Gas is a mix of propane and silicone oil. CO2 comes in disposable cartridges inserted into the magazine.

GBB vs AEG

GBB guns offer a more realistic experience but have lower magazine capacity and need more maintenance. AEG (electric) guns are more reliable and hold more rounds but lack recoil.

• GBB: Realism, lower capacity (15–30 rounds), temperature-sensitive
• AEG: Reliability, high capacity (300+ rounds), year-round use

GBB maintenance

GBB guns require regular maintenance:

• Lubricate seals after every game
• Clean the barrel
• Check magazine seals for leaks
• Store with a small amount of gas in the magazine

Related terms: AEG, Green Gas, airsoft, blowback, GBBR