HPA Adapter MK23 Series to M4

A modular HPA adapter that converts compatible MK23 Series gas magazines to use an external HPA system with Airsoft M4 AEG magazines.

Product Features:

• Compatible with TM MK23, SSX23, SSX303 and clone MK23 platforms.
• Compatible with a wide range of Airsoft M4 AEG magazines.
• Fully printed gas magazine construction.
• Maintains high internal air volume.
• Reduced weight compared to previous adapter designs.
• Plug and play design with valve, feed lips and gas router pre-installed.
• No donor parts or assembly required.
• Integrated grub screw adjustment allows optimisation of the nozzle-to-gas router seal.
• Supplied with M4 magazine fitment shims.
• Compatible with interchangeable AIRTAC modular magwells including M4, Angled M4, MP5, Shotgun Shell and Compact Drum configurations.
• US Foster HPA quick disconnect fitting supplied as standard.
• Recommended operating pressure: 90-150 PSI.
• Maximum operating pressure: 150 PSI.

The AIRTAC MK23 Series to M4 HPA Adapter is a modular conversion system designed to allow compatible MK23 Series gas magazines to operate from an external High Pressure Air system while feeding from Airsoft M4 AEG magazines. Compatible with TM MK23, SSX23, SSX303 and clone platforms, it provides increased ammunition capacity while retaining the compact handling characteristics of the MK23 platform.

The adapter features a fully printed gas magazine which maintains a high internal air volume while significantly reducing weight compared to previous designs. This revised construction also improves modularity and simplifies assembly. The M4 magwell can be exchanged for other compatible AIRTAC modular magwells, allowing users to switch between different magazine formats without replacing the complete adapter.

Supplied fully assembled, the adapter includes the valve, feed lips and gas router already installed, eliminating the need for donor magazine components. Two integrated grub screws allow adjustment of the adapter position to optimise the seal between the nozzle and gas router, while the supplied magazine shims help achieve a secure fit with compatible Airsoft M4 AEG magazines.

The adapter is supplied with a standard US Foster HPA fitting and is designed for use with regulated HPA systems operating between 90 and 150 PSI, with a maximum operating pressure of 150 PSI.

Range Overview:

AirTac’s HPA Adapters range converts traditional gas-powered replicas to use high-pressure air magazine systems with seamless reliability. Designed for multiple replica platforms, each adapter features precision-moulded construction, a secure BB-retention system, and standardised US-thread fittings for broad compatibility. The range combines rugged strength with practical installation, giving players smoother reloads and extended playtime through improved air efficiency and modular flexibility.

• Injection-moulded polymer housings provide durability and consistent alignment
• Standard US-thread fittings ensure cross-system HPA compatibility
• Integrated BB-retention systems prevent feed loss during reloads
• Supplied with magwell inserts, screws and shim sets for precise fitment
• Available for multiple pistol and SMG platforms for modular loadouts
• Engineered for reliability, consistency and long-term performance

Brand Statement:

AirTac specialise in developing high-performance HPA conversion systems for airsoft enthusiasts seeking consistent, efficient, and adaptable performance. Their focus on precision engineering and robust construction ensures every product delivers dependable field use, intuitive function, and lasting value.

Safety Information:

Do not exceed 150 PSI when operating any airsoft HPA adapter Always use air regulated by a secondary regulator Check PSI output before connecting air to the adapter Do not connect directly to unregulated air sources, CO2 systems, or high-pressure tanks Do not use with incompatible high-pressure air lines or fittings Always ensure correct setup and operation before use