PolarStar JACK HPA Conversion Kit
PolarStar JACK HPA Conversion Kit
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DETAILS
DETAILS
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PolarStar JACK HPA Conversion Kit
Reliable HPA performance with simple tuning and proven durability. The PolarStar JACK is one of the most popular drop-in HPA conversion engines in airsoft, offering consistent shot performance, reduced mechanical wear, and straightforward tuning. Designed as a replacement for traditional gearbox internals, the JACK delivers fast trigger response and dependable operation for both casual players and experienced builders.
Open Bolt Single Solenoid Design
The JACK utilises a single-solenoid open bolt system, making it simple to configure while still providing excellent air efficiency and consistent FPS output. This streamlined design reduces complexity compared to dual-solenoid systems while maintaining strong performance.
Consistent Performance & Reliability
By eliminating gears, pistons, and springs, the JACK reduces mechanical stress inside the platform. This results in smoother cycling, improved reliability, and reduced maintenance requirements during extended gameplay.
Drop-In Conversion Platform
The JACK is engineered as a drop-in engine for compatible gearboxes, allowing players to convert AEG platforms to HPA with minimal modification (platform dependent).
Available Platform Variants
This listing combines multiple PolarStar JACK conversion kits. Please select the correct version before purchase:
- Ares Amoeba EFCS / APS ESE
- Ares M4
- KAC LMG
- M249
- M60
- S&T TAR-21
- Version 2 M4 / M16
- Version 3 AK
- VFC HK417
Key Features
- PolarStar JACK HPA engine
- Single-solenoid open bolt system
- Consistent FPS output
- Adjustable dwell and rate of fire
- Reduced gearbox wear
- Reliable and efficient air usage
- Multiple platform-specific variants available
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | PolarStar |
| Engine Type | Single-Solenoid Open Bolt HPA Engine |
| Power Source | HPA (External Tank & Regulator Required) |
| Gearbox Compatibility | Platform Specific (Variant Dependent) |
| Tuning | Dwell & Rate of Fire Adjustment |
What’s Included
- PolarStar JACK HPA Engine (platform specific)
- Wiring harness
- Installation components (variant dependent)
Important Information
Installation: Professional installation is recommended for HPA engine conversions.
Compatibility: Ensure correct gearbox / platform variant is selected before purchase.
HPA System: Requires external HPA tank, regulator, and line (sold separately).
Use: Intended for airsoft use only.
Simple tuning, proven performance, and dependable reliability — the PolarStar JACK remains one of the best entry points into HPA engine conversions.
PolarStar Engine Comparison Guide
Not sure which PolarStar engine is right for your build? Use this quick comparison to understand the key differences between the JACK, F2, and Kythera systems.
| Feature | PolarStar JACK | PolarStar F2 | PolarStar Kythera |
|---|---|---|---|
| Engine Type | Single Solenoid | Dual Solenoid | Mechanical Closed-Bolt |
| Electronics Required | Yes (FCU & Battery) | Yes (FCU & Battery) | No |
| Trigger Feel | Electronic | Electronic | Mechanical / Realistic |
| Tuning Capability | Good | Advanced / Independent Nozzle & Poppet Control | Mechanical Adjustments Only |
| Air Efficiency | Very Good | Excellent | Excellent |
| Rate of Fire Potential | High | Very High | Semi-Focused |
| Best For | Affordable HPA conversions | High performance competitive builds | Realistic / DMR / Battery-free builds |
| Installation Complexity | Moderate | Moderate | Moderate |
| Reliability | Excellent | Excellent | Excellent |
Quick Buyer Advice
- Choose JACK if you want a reliable and cost-effective entry into HPA.
- Choose F2 if you want maximum tuning control, performance, and competitive capability.
- Choose Kythera if you want a battery-free mechanical system with realistic trigger feel.