EPeS Airsoft CNC Aluminum Cylinder Head Mk.II (V2 & V3 Gearboxes) – Precision Air Seal Upgrade

The EPeS AEG Aluminum Cylinder Head Mk.II is a premium CNC-engineered upgrade designed for players who demand maximum air seal efficiency, improved durability, and consistent performance from their AEG builds. Built from aircraft-grade EN AW 7075-T6 aluminum with a specialized H+PTFE surface finish, this cylinder head redefines gearbox reliability for both Version 2 and Version 3 platforms.

Whether you’re tuning a high-ROF CQB build or optimizing a long-range DMR setup, this cylinder head delivers unmatched sealing, stability, and mechanical consistency.

Precision CNC Construction for Maximum Durability

At the core of the Mk.II design is uncompromising engineering quality. The cylinder head is machined from EN AW 7075-T6 duralumin, a material widely used in aerospace applications for its exceptional strength-to-weight ratio.

Key material advantages include:

• CNC-machined 7075-T6 aluminum for structural rigidity

• H+PTFE surface treatment for ultra-smooth nozzle cycling

• High abrasion resistance for long-term gearbox reliability

• Designed for heavy-duty AEG builds and high-stress use

This combination ensures smooth piston cycling, reduced friction, and long service life even under high-rate firing conditions.

Advanced Air Seal & Feeding Performance

The EPeS Mk.II cylinder head is engineered to solve one of the most common AEG problems: balancing airtight compression with reliable BB feeding.

Its advanced features include:

• Double O-ring sealing system for superior air compression

• Optimized nozzle stability for consistent hop-up engagement

• Reduced air loss for improved FPS consistency

• Compatible with most Version 2 and Version 3 AEG gearboxes

By improving both seal efficiency and nozzle alignment, the Mk.II enhances shot-to-shot consistency while supporting higher-performance internal setups.

Revolutionary Tappet Plate Stroke Optimization

One of the standout innovations of this cylinder head is its extended tappet plate stroke capability. Unlike standard designs, the rear stop position is repositioned to allow increased nozzle travel.

Benefits include:

• Supports longer nozzles (up to ~1mm longer than standard setups)

• Improved feeding reliability in high-speed builds

• Better nozzle-to-hop-up bucking contact seal

• Ideal for AR15/M4-style and tuned DMR platforms

This solves the long-standing tradeoff between feeding reliability and air seal performance—allowing both to coexist in one setup.

Universal Fit System for V2 & V3 Gearboxes

The Mk.II introduces a unique mounting system designed for precision alignment inside the gearbox shell.

Features include:

• Dual M3 grub screw adjustment system

• Tunable gearbox pin hole tolerance

• Secure anti-wobble cylinder head seating

• Optimized default fit for Retro Arms gearboxes

This eliminates axial movement, reducing:

• FPS inconsistency

• Nozzle misalignment

• Hop-up feeding issues

• Internal wear and stress damage

Installation is straightforward, allowing techs to fine-tune fitment with simple adjustments for a rock-solid gearbox lockup.

Key Takeaways

• CNC 7075-T6 aluminum construction for extreme durability

• Double O-ring system for superior air seal efficiency

• Extended tappet stroke improves feeding and performance balance

• Adjustable universal mounting system for V2 & V3 compatibility

• Designed for high-performance AEG builds and long-term reliability

Why Choose the EPeS Mk.II Cylinder Head?

If your goal is to eliminate compression loss, improve feeding reliability, and stabilize gearbox performance under stress, the EPeS Mk.II cylinder head for V2/V3 AEG gearboxes delivers a professional-grade solution. It bridges the gap between high air seal efficiency and flawless BB feeding—without compromise.

For advanced AEG builders, it’s not just an upgrade—it’s a foundation for consistent, competition-ready performance.