HPA Engines

An HPA engine is an internal pneumatic system used in airsoft guns that replaces the traditional gearbox or gas mechanism. Instead of generating air pressure inside the gun, the system uses compressed air supplied from an external tank.

When the trigger is pulled, the engine releases a controlled burst of air through a valve, propelling the BB through the barrel. Because the pressure is regulated externally, HPA systems are known for their consistent performance and high level of adjustability.

HPA engines are commonly installed inside the receiver where a standard gearbox would normally be located and are typically used together with a regulator, air line and high-pressure air tank.

In this category you will find HPA engines for airsoft guns, compatible with various airsoft platforms.