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Maximising Your Wolverine MTW AK-105: The UK FPS & PSI Guide

The Wolverine MTW (Modular Training Weapon) ecosystem has long been the gold standard for HPA (High-Pressure Air) performance. So, when Wolverine announced they were bringing their legendary build quality and out-of-the-box reliability to the AK platform, the airsoft community collectively lost its mind.

The Wolverine MTW AK-105 delivers exactly what you'd expect: a stamped steel receiver, authentic takedown, and the jaw-dropping performance of the Inferno Gen2 HPA engine.

However, running high-end HPA platforms under strict UK power regulations requires a little bit of fine-tuning. If you've just picked up your AK-105 or are planning to buy one, there is one crucial setup step you need to know about to ensure flawless performance on game day.

The UK HPA Dilemma: Low PSI vs. Feeding Issues

In the UK, site power limits generally cap fully automatic replicas at 350 FPS (or roughly 1.14 Joules) on a 0.20g BB.

Because the Wolverine Inferno Gen2 engine is incredibly efficient, it doesn't need a lot of air to push a BB to that velocity. Out of the box, you might find that you have to drop your regulator down to a very low PSI (Pounds per Square Inch)—sometimes under 70 or 80 PSI—to stay legally compliant under UK limits.

While the engine can fire at low pressures, running the platform at a low PSI can occasionally cause performance anomalies:

  • Inconsistent feeding from your mid-cap magazines.

  • Minor nozzle stiction or sluggish cycling.

  • Slight FPS variance between shots.

HPA systems thrive on crisp, pressurized air. To get the absolute best trigger response and reset behavior, the engine ideally wants to be run at a healthier pressure (around 90 to 110 PSI). But how do you raise the pressure without blasting past your local site's chronograph limits?

The Solution: The Green Flow Restrictor

Wolverine Airsoft anticipated this exact scenario for regions with lower velocity limits. Tucked away inside the box of every MTW AK-105 is a tiny, easily missed component: the green flow restrictor.

This small insert physically restricts the volume of air passing through the engine without lowering the pressure driving the mechanics. By installing it, you can safely bump your regulator up to a higher, more stable PSI. This gives you the snappy performance and reliable feeding the MTW is famous for, while keeping your FPS comfortably within UK site limits.

How to Fit It

Installing the restrictor takes less than five minutes and requires minimal tools. To make it as simple as possible, check out this quick walkthrough video guiding you through the exact process:

Watch: How to fit the Wolverine Green Flow Restrictor

 

Quick Takeaways:

  1. Don't lose the box accessories: Make sure to grab the green restrictor insert before tossing your packaging.

  2. Tune with your chrono: Always install the restrictor before arriving at the game site, and check your numbers on a reliable chronograph with the BB weight you intend to use.

  3. Enjoy the snappy trigger: With the restrictor installed and your PSI dialed into the sweet spot, your AK-105 will feed flawlessly and cycle with absolute consistency.

Headed to a game this weekend? Grab your Wolverine MTW AK-105 and all your HPA tech essentials right here at bztactical.co.uk. If you have any questions about tuning your rig, drop by the shop or reach out to our tech team!