HPA

HPA (High Pressure Air) is a pneumatic system for airsoft guns. It uses compressed air from an external tank, fed through a regulator, to propel BBs with highly consistent power output.

How does HPA work?

An HPA system consists of four main components:

Tank: Holds compressed air at 3000–4500 PSI. Aluminum tanks are cheaper; carbon fiber tanks are lighter.

Regulator: Reduces tank pressure to an operating level of 60–140 PSI. Adjusting the pressure changes the gun’s FPS.

Line (hose): Connects the regulator to the gun. Length ranges from 60–120 cm based on player preference.

Engine: Replaces the gearbox or installs into an existing AEG. It controls air release for each shot.

Types of HPA engines

HPA vs AEG

HPA advantages: FPS consistency (+/– 1–2 FPS), instant trigger response, easy power adjustment via regulator, quiet operation, minimal maintenance.

HPA disadvantages: High upfront cost ($400–1000+), need to carry a tank and line, dependence on access to air refills.

HPA is popular among experienced players and snipers for precision shooting. Beginners are better served by an electric AEG.

HPA costs

Basic setup: Engine ($130–500), regulator ($50–160), tank ($40–200), line ($20–40). Total $400–900 without the gun.

Running costs are low. Filling a tank costs $2–5 and lasts for hundreds of shots.

Related terms: AEG, Gearbox, FPS, Regulator, airsoft batteries