FX Impact M4 First Stage Tuning Regulator by Huma-Air

Impact M4 first-stage reg: for fine-tuning accuracyHuub Andriessen

I'll be straight with you: if your FX Impact M4 is already shooting consistent velocities and you're happy with your standard deviations, you don't need this. The factory second-stage regulator does a decent job on its own. But if you're chasing tighter groups at longer ranges and you're seeing a bell curve in your velocity data across a fill cycle, adding a first-stage regulator makes a real difference, it takes the pressure load off that second regulator and keeps output pressure far more stable from first shot to last. Not a fix for a tuning problem, but a genuine upgrade for serious accuracy work. My tip: set the first-stage pressure 30 to 40 bar above your second-stage setting and chronograph a full string before making any further adjustments.

FX Impact M4 First Stage Tuning Regulator by Huma-Air

This first stage tuning regulator for your FX Impact M4 build by Huma-Air is specially designed to get all bennefits of the first stage regulator system also used on the FX Impact M3
By creating a Dual Stage regulator system on the FX Impact M4 the first regulator pre-reduces the pressure in preparation for the second regulator. This provides less stress on the second regulator and achieves a more constant output pressure with less standard deviations. Advised is to use about 30-40 BAR difference between the 1st & 2nd regulator.

This regulator is an easy fit using our fitting guide (see download tab)

It comes with an extra pressure gauge with black dial to read the regulated first stage pressure and 2 bonded seals with different thickness to align this gauge to the body of the impact.

Pressure can be set by turning the set-screw of the regulator what can be found inside the regulator. Half a turn counter clockwise equals to about 25-30 bar pressure increase. The set pressure can be read on the rifle’s pressure gauge.
The Huma-Air tuning regulator will ad 23 mm in length compared to the factory regulator.

The benefits of this Huma-Air tuning regulator for your FX Impact M4

• Higher accuracy due to the elimination of the pelletspeed fluctuations.
• Quick refill after every shot.
• Reduces the stress on the second stage regulator
• Fitting instructions available as pdf download

Pressure settings of the Huma-Air Dual Stage Use Bottle Regulator For The FX Impact M4

Your FX Impact M4 first stage regulator comes preset on the pressure we have tesed it and it is marked on the packing. You can set the regulator according to your wishes within the pressure range.
The output pressure will be shown on the extra pressure gauge what comes with the set.
The Huma-Air FX Impact M4 first stage regulator comes in a wide pressure range of 70-210 bar output covering sub 12 ft/lbs and FAC models.

Huma-Air Quality Control

Huma-Air regulators are CNC produced out of high grade aircraft Aluminum and bronze and steel.
To guarantee a perfect product, every regulator is manually assembled, tested and adjusted to the requested pressure.
We only use high-end materials and our belleville springs are designed for critical applications to achieve the highest repeat accuracy. This gives our regulators a repeat cycle less than 1% difference.