GNB

GNB (Gas Non-Blowback) refers to gas-powered airsoft guns that do not cycle the slide/bolt when firing. Compressed gas is used only to propel the BBs, not to move the slide as in GBB guns. This makes the mechanism simpler, quieter, and highly efficient in terms of gas consumption. Popular GNB models such as the Tokyo Marui MK23 and Novritsch SSX23 are commonly used as secondary sniper pistols or silent primary weapons for stealth engagements. You can find GNB guns in our online store.

Difference between GNB and GBB?

GNB (Gas Non-Blowback): slide does not move, virtually no recoil, quieter shot, very high gas efficiency.
GBB (Gas Blowback): gas cycles the slide after each shot, simulating recoil and a realistic shooting experience.

Simply put – GNB focuses on efficiency and stealth, GBB focuses on realism and experience.

Advantages of GNB guns

Extremely low gas consumption – more shots per fill.
Very quiet operation – ideal for snipers and stealth takedowns.
Fewer moving parts – higher reliability and reduced wear.
High FPS/J consistency.

Disadvantages of GNB guns

Less realistic shooting feel – no blowback or slide movement.
Slower reloads – especially for manually fed carbines.
Lower “fun factor” for realism-focused players.

Notable GNB models in airsoft

Some of the most legendary GNB guns are valued for reliability, accuracy, and quiet operation:

Tokyo Marui MK23 SOCOM – widely considered the quietest airsoft pistol available.
Novritsch SSX23 – modernized MK23 platform with better internal precision.
Novritsch SSX303 – GNB carbine based on MK23, excellent consistency and accuracy.
ASG MK23 STTI – budget-friendly variant favored for easy tuning.

These GNB models are often used as secondary sniper pistols or silent primary weapons for ambush roles.

Why are GNB guns so popular today?

The combination of quiet shots, low operating cost, widely available spare parts, and upgrade options makes GNB an ideal choice for players seeking performance without noise. While they don’t offer the realism of GBB guns, from a practical tactical perspective, GNB guns have clear advantages in airsoft gameplay.