AirTac HPA Adapter Hi-Capa to M4 (Straight)

The AirTac HPA Adapter Hi-Capa to M4 (Straight) is a high-performance conversion solution that allows Hi-Capa gas blowback pistols to utilise standard M4 AEG magazines while running on a regulated HPA system. Designed for maximum consistency, increased ammunition capacity and reliable year-round performance, this adapter transforms your Hi-Capa into a highly competitive platform suited to both skirmish and speedsoft environments.

Key Features (Quick View)

• Durable injection-moulded polymer construction

• Straight adapter configuration

• Pre-installed US-thread HPA fitting

• Integrated BB-retention system

• Compatible with standard M4 AEG magazines

• Eliminates gas cooldown issues

• Consistent FPS and shot-to-shot performance

• Reliable operation in cold weather

• Removable magwell and shim set included

• Designed for Hi-Capa GBB pistols

Construction & Reliability

Manufactured from durable injection-moulded polymer, the AirTac Hi-Capa Adapter is built to withstand regular skirmish use while maintaining precise alignment and fitment. The robust construction ensures long-term reliability without adding unnecessary weight to the platform.

A pre-installed US-thread HPA fitting simplifies setup and allows direct integration with most standard HPA systems. The integrated BB-retention system helps prevent ammunition loss during magazine changes while maintaining dependable feeding under rapid-fire conditions.

The included removable magwell and shim set allow users to fine-tune fitment for optimal compatibility and feeding performance.

Performance & Field Use

Converting a Hi-Capa pistol to HPA removes the common limitations associated with green gas and CO₂ systems. By delivering regulated air pressure directly to the replica, the adapter provides consistent FPS, stable accuracy and reliable performance regardless of firing tempo or ambient temperature.

The ability to use standard M4 AEG magazines dramatically increases ammunition capacity, reducing reload frequency and making the platform highly effective for competitive environments, extended skirmishes and high-intensity gameplay.

Unlike traditional gas systems, HPA performance remains stable in cold weather conditions, allowing players to maintain consistent operation throughout the year.

The straight adapter design keeps the setup compact and streamlined while providing a natural magazine profile for players who prefer a traditional rifle magazine orientation.

Compatibility

• Hi-Capa gas blowback pistols

• Standard M4 AEG magazines

• HPA systems using US-thread fittings

• Regulated HPA air supplies

• Standard HPA airlines and regulators

Ideal For

• Hi-Capa HPA conversions

• Speedsoft players

• Competitive airsoft gameplay

• CQB environments

• Players seeking increased magazine capacity

• Users wanting consistent year-round performance

Product Specifications

• Brand: AirTac

• Model: Hi-Capa to M4 Adapter (Straight)

• Product Type: HPA Magazine Adapter

• Material: Injection-Moulded Polymer

• Colour: Black

• Other Relevant Specs:

  • US-Thread HPA Fitting

  • Integrated BB-Retention System

  • Straight Magazine Configuration

  • Removable Magwell Included

  • Shim Set Included

  • M4 Magazine Compatible

Range Overview – AirTac HPA Adapters

AirTac HPA Adapters are engineered to convert traditional gas-powered airsoft platforms into highly efficient HPA systems. Designed around durability, reliability and ease of use, each adapter features precision moulded construction, integrated BB-retention technology and standardised HPA fittings for broad compatibility.

Supporting a variety of pistol and SMG platforms, the AirTac adapter range provides increased ammunition capacity, improved consistency and dependable performance for players seeking a competitive edge.

Manufacturer

AirTac specialises in high-performance HPA conversion systems and accessories for airsoft players seeking efficient, reliable and adaptable equipment. With a focus on precision engineering and practical design, AirTac products are built to deliver dependable field performance and long-term durability.

Safety Information

Do not exceed 150 PSI when operating any airsoft HPA adapter.

Always use a suitable secondary regulator and verify output pressure before connecting the adapter. Never connect directly to unregulated air sources, CO₂ systems or high-pressure tanks.

Ensure all airlines, fittings and connectors are compatible and correctly installed before use. Regularly inspect all components for signs of wear or damage and replace any worn parts immediately.