Redline AirStock Gen2 Air System Kit for PolarStar & HPA Engines

The Redline AirStock Gen2 Air System Kit is a purpose-built solution for HPA airsoft players who want to eliminate remote air lines without sacrificing performance, consistency, or reliability. Designed and engineered by Redline Airsoft, this innovative stock-mounted air system allows you to mount a compact HPA tank directly to your rifle, creating a clean, fully self-contained setup that excels in both competitive and tactical environments.

At its core, the AirStock Gen2 replaces the traditional remote hose with a streamlined, rifle-mounted air source. By attaching a compatible 13ci HPA tank directly to the stock, players gain unmatched freedom of movement, reduced snag points, and a more realistic rifle balance. This makes the AirStock Gen2 an ideal upgrade for CQB-focused builds, speedsoft loadouts, or outdoor rifles where mobility and ergonomics matter most.

Durable Construction Built for Field Abuse

The Redline AirStock Gen2 is constructed from a robust combination of steel, aluminum, and brass, ensuring long-term durability under heavy use. Every component is designed to withstand the rigors of competitive play while maintaining precise air regulation. The stock assembly feels solid and well-balanced on standard M4-style platforms, distributing weight naturally into the shoulder for improved control and stability.

Integrated sling loops allow easy attachment of single-point or two-point slings, further enhancing the AirStock’s versatility for different playstyles and loadouts.

Integrated Firebase Regulator for Consistent Performance

Included with the AirStock Gen2 is Redline’s proven Firebase Regulator, factory-installed and tuned for HPA airsoft applications. This regulator safely and efficiently reduces pressure from the HPA tank to your engine, delivering consistent air flow and shot-to-shot stability. Depending on your engine setup and tuning, users can expect approximately 700 to 900 shots per fill from a 13ci tank.

Because the regulator is fully integrated, there’s no need for additional external components or custom routing. The result is a clean, professional installation that performs reliably game after game.

Engine Compatibility & Installation

The Redline AirStock Gen2 is compatible with a wide range of popular HPA engines, including:

• PolarStar JACK

• PolarStar F1

• Redline N7

• Wolverine HPA engines

⚠️ Note: The AirStock Gen2 is not recommended for PolarStar Fusion Engines.

The kit includes all required hoses, fittings, bolts, and mounting hardware, making installation straightforward on both VFC and non-VFC bodied rifles. Once installed, the system creates a fully contained HPA rifle with no external air line, ideal for aggressive movement and close-quarters play.

Important Tank Compatibility Disclaimer

For safe operation, the Redline AirStock Gen2 is designed exclusively for use with:

• Ninja 13ci SLP HPA tanks

• Guerrilla Air 13ci ELP HPA tanks

Use of tanks with an output pressure greater than 300 PSI may result in damage to the system and is not recommended.

Why Choose the Redline AirStock Gen2?

If you’re looking to simplify your HPA setup while improving handling, realism, and mobility, the Redline AirStock Gen2 is one of the most effective upgrades available. With premium materials, an integrated Firebase regulator, and a clean tank-mounted design, it delivers professional-level performance without the drawbacks of traditional remote-line systems.

Whether you’re building a compact CQB rifle or refining a competitive HPA platform, the Redline AirStock Gen2 Air System Kit offers a smart, durable, and performance-driven solution trusted by serious airsoft players worldwide.