HPA Airsoft Explained: A Beginner’s Guide to Tanks, Regulators and Engines

HPA (high-pressure air) is the most consistent way to power an airsoft replica. Instead of a battery or gas in the magazine, your gun runs on compressed air from a tank you carry on your kit. This guide explains how it works, what you need and what it costs.

Thinking about switching? Bring your rifle or pistol into our Thetford shop and we’ll talk you through the options. Call 01842 683567.

Why go HPA?

• Consistency: shot-to-shot power stays steady, so your accuracy does too.
• Weather-proof: unlike green gas, compressed air isn’t badly affected by the cold.
• Tunable: you set the pressure at the regulator, so it’s easy to stay within a site’s power limits.
• Cheap to run: once you have the kit, refills cost very little.

The trade-offs: there’s more to buy up front, and you have a line running from the tank to your gun.

What you need

1. A tank (bottle): holds air at high pressure, usually 3,000 psi for airsoft tanks. A 0.8L tank such as the ACM 0.8L 3000 psi tank: £33.95 or a compact Spirit Field 26ci tank with regulator: £49.95 will last a long game day for most players.
2. A regulator: brings the pressure down from the tank to a usable level, often between about 80 and 150 psi. Some tanks have one built in; otherwise a “line regulator” sits between the tank and the gun.
3. A line: the hose from the regulator to your gun, such as the Strike Airsoft 40″ flexy line: £24.95. The Strike Airsoft regulator and line bundle: £79.95 gets you both in one go.
4. Something to run on air: either an HPA engine in an AEG, an HPA-ready rifle, or an adapter for a gas pistol or rifle (see below).

Three ways into HPA

1. Buy an HPA-ready rifle

The simplest route. These come with an HPA engine already fitted:

• Huntsman Tactical M4 PDW with Wolverine Gen 2: £412.95
• Double Bell L119A2 Neptune SAS with Wolverine Gen 2: £475.95
• Well PRO AK blowback HPA: £467.95

2. Convert an AEG with an HPA engine

An engine such as the Wolverine Inferno Gen 2 with Spartan electronics: £311.95 replaces the AEG gearbox. It’s a bigger job than an adapter, so ask us about fitting before you buy.

3. Run a gas pistol or gas rifle on HPA

An adapter lets your gas gun run from a tank instead of gas, which is ideal in winter. Examples: the Saigo Defense Hi-Capa HPA M4 adapter: £116.95 for Hi-Capa pistols, or BO Manufacture HPA magazine valves: £5.95 for some gas rifle magazines. Fit varies between makes, so ask us before ordering.

Want it all in one box?

The BO Manufacture complete HPA package (0.8L tank set): £132.95 is a complete package built around a 0.8L tank. Check the product page for exactly what’s included.

Refills

We fill HPA tanks at our Thetford shop (HPA refill: £3.00). Some game sites and dive centres also offer fills. Never fill a tank beyond its rated pressure.

Safety

• Treat a charged tank with respect: it holds air at very high pressure.
• Check your tank’s test date and markings, and don’t use a damaged or out-of-date tank.
• Always chrono your setup at the site, and stick to the site’s power limits.
• Turn the air off and de-gas the line when you’re not playing.

Questions?

HPA has a lot of parts that need to match. Call 01842 683567 or visit us at 20 Castle Street, Thetford, IP24 2DW, and we’ll help you build a setup that works first time.