Backdraft Phoenix M4 HPA Engine + FCU

When I got into HPA, a name-brand engine cost $300–400 before you even bought an FCU. CRAZY! So I made my own, and it turned out so good I just HAD to share it. Over 50 players have already left it a 5 star review, and if it’s not for you, you can return it with our 30-Day Field Test Guarantee!

— Aiden, Backdraft Innovations

Not sure which nozzle you need? Use our nozzle calculator to find yours in about 30 seconds, or add an extra nozzle in the options above for $20 ($5 off the $25 standalone price), or grab a third for just $15 ($10 off), so you’re covered.

What it does

The Phoenix M4 replaces the motor, piston and cylinder in your M4/AR-style AEG with high-pressure air, for faster trigger response, a higher rate of fire, adjustable power and far less maintenance. It drops into a standard V2 gearbox in about 30 minutes.

Specs & features

• Rate of fire: 40+ RPS
• Operating pressure: 40–145 PSI
• Design: open bolt
• Gearbox: V2 (M4/AR-style)
• Nozzle: ships with the #01 nozzle (M4/MP5). 21 nozzle lengths available.

FCU options

• Catalyst Gen 2 (included): safe, semi, full auto, binary, 2- and 3-round burst, set on 2 selector positions with the switch and buttons on the board. No app needed.
• Catalyst Wireless (+$80): tune dwell, delay and fire modes from your phone without opening your gun. Adds burst from 2 to 20 shots, ramping, a third selector position, and mag and tracer control.

In the box

• Phoenix HPA engine (#01 nozzle)
• Catalyst Gen 2 FCU (or the Catalyst Wireless, +$80)
• M4 (V2) trigger board
• Long or short wire harness
• Inner grip line with brass quick-disconnect fitting

Compatibility

The Phoenix fits any center-line airsoft AEG gearbox. Confirmed fits include guns from Tokyo Marui, G&G, CYMA, VFC, A&K, ICS, JG, King Arms, Classic Army, Elite Force, LCT, ARES, S&T, PTS, Echo1 and CG. Check your exact model with the nozzle calculator.

FAQ

Will it fit my gun?
If it’s an M4/AR-style AEG with a standard V2 gearbox, almost certainly. The #01 nozzle in the box fits most M4s. For anything else, our nozzle calculator tells you which of our 21 nozzle lengths you need. We use Polarstar’s nozzle numbering, so if you know your Polarstar nozzle number, that’s your number.

Is it hard to install?
If you can use a screwdriver and follow a video, you can do it. Most V2 installs take about 30 minutes with our install video, and our Discord is there if you get stuck.

What else do I need to run HPA?
An HPA tank, a regulator and an air line. Want to try it before you buy a tank? Our Unlimited Air Adapter ($20) runs your gun straight off a home air compressor for testing and tuning.

What if something breaks?
We offer 24/7 tech support, and our Discord has real players who’ve done this install hundreds of times and are always happy to help. Reach out anytime and we’ll get you back on the field.

What’s the 30-Day Field Test Guarantee?
Try it in your gun for 30 days. If it’s not for you, send it back for a full refund. Read the full policy.

Good to know

• International customers are responsible for any customs fees.
• Import rules in some countries require semi-only electronics.
• Pay-in-4 is available at checkout.