MAXX Model 2026 Threaded HPA Front Housing – PolarStar & Wolverine

The front housing is where your HPA engine meets the hop up chamber. MAXX Model's 2026 threaded front housing replaces the engine's stock part with a CNC machined aluminium housing that a MAXX hop up chamber screws directly onto. Locking the two together helps keep the nozzle, chamber and bucking lined up, for a consistent air seal and reliable feeding.

It's made in seven versions, so choose the one that matches your engine. Fitting is simple: unscrew the stock front housing from the engine, screw the MAXX housing on in its place, then rotate the engine to line up the air-line connection. MAXX's instructions cover their 2026 hop up chambers and their earlier chambers, using brass spacers to set the depth.

Versions

• PolarStar F2 (MX-HPA004PF2)
• PolarStar Jack (MX-HPA004PJK)
• PolarStar Kythera (MX-HPA004PKA)
• Wolverine Inferno Gen2, AEG (MX-HPA004WI2)
• Wolverine Inferno XTS, AEG (MX-HPA004WIX)
• Wolverine Inferno Gen2, MTW (MX-HPA005WI2)
• Wolverine Inferno XTS, MTW (MX-HPA005WIX)

The PolarStar and Wolverine AEG versions are for engines fitted in a V2/V3 AEG gearbox. The MTW versions are for Inferno engines in a Wolverine MTW.

Key specs

• Brand: MAXX Model
• Material: CNC machined aluminium
• Threaded front for MAXX hop up chambers
• Replaces the engine's stock front housing
• HPA engine, gearbox and hop up chamber not included

Fitting tip

Use a light smear of silicone grease on the O-rings (Abbey Silicone Grease works well), tighten firmly without overtightening, and do a BB drop test before you play: with the nozzle retracted, a BB in the feed tube should sit between the nozzle tip and the bucking lip. If your nozzle length needs changing, we stock PolarStar F2 nozzles, PolarStar Jack nozzles and PolarStar Kythera SA nozzles.

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