PolarStar Jack HPA Engine V2-M4 Conversion

The PolarStar Jack HPA engine answers the demand for accessible, high-performance HPA conversion technology. This drop-in replacement transforms your AEG into a reliable, efficient platform—perfect for skirmishers and milsim players seeking consistent power and reduced maintenance.

Key Features

• Drop-in cylinder replacement – no complex modification required
• Universally compatible with V2-M4 gearbox centre-line nozzles
• PolarStar filter fitting included – ready to connect to your HPA rig
• Affordable entry point to HPA reliability and performance
• Reduced wear on gearbox components compared to spring systems
• Consistent FPS output across full magazine capacity

Real-World Use Cases

The Jack engine suits players transitioning from spring or AEG systems to HPA without major downtime or investment. Its universal compatibility means you can upgrade an existing M4 platform quickly. Ideal for site rentals converting to private builds, or skirmishers seeking reliability during multi-game days. The included filter fitting accelerates setup on the field.

Technical Specifications

• Engine type: HPA (High Pressure Air) conversion
• Gearbox compatibility: V2-M4 centre-line nozzle
• Installation: Drop-in cylinder replacement
• Included: PolarStar filter fitting

Compatibility & Upgrades

The Jack engine is designed as a universal replacement for V2-M4 gearboxes with centre-line nozzles. You’ll need a compatible HPA regulator and line (not included). Most M4 platforms and variants will accept this engine. Always verify your gearbox version before ordering. For detailed compatibility queries, contact our team.

UK Legal & Site Notes

HPA systems themselves are legal for UK airsoft use. However, site chronograph limits apply—your final FPS depends on your regulator settings and air pressure. Always check with your local site before deployment. HPA engines are often preferred at sites with tight chrono windows due to their consistency and adjustability.

Ready to upgrade? The PolarStar Jack HPA engine is in stock at Airsoftdirect UK. Add it to your cart today and join the efficient, low-maintenance HPA revolution.