Airtac SSX23/303/TM MK23 HPA Adapter - Plug and Play M4

AirTac SSX23/303/TM MK23 HPA Adapter - Plug and Play M4

Looking to turn your sidearm into a high-capacity CQB monster? The AirTac SSX23/303/TM MK23 HPA Adapter has you covered. This HPA Adapter has been precision-engineered by AirTac for skirmishers, speedsoft players, and sniper sidearm builds. With this custom HPA adapter, you can use standard Airsoft M4 AEG magazines with your Tokyo Marui MK23, Novritsch SSX23, or ASG STTI MK23 NBB Pistols.

Proudly designed and manufactured in the UK with advanced 3D-printed SLS nylon polymer. The MK2 Series HPA Adapter features a streamlined modular feed path, a heavy-duty single-piece magazine latch, and an integrated US-style Foster HPA quick-disconnect fitting. Replacing the prone gas valves with a High-Pressure Air source and high-capacity M4 mags, you can expect consistent FPS with zero cooldown. You'll no longer need to reload a heavy gas mag, this HPA Adapter by AirTac keeps you going for longer.

Why Should I Buy the MK2 M4 HPA Adapter by AirTac?

• M4 AEG Magazine Interface: You can convert your NBB Airsoft Pistol to accept mid-cap and hi-cap M4 AEG magazines. Get a whopping 120-150+ rounds of uninterrupted fire.
• Zero Gas Cooldown & Consistent Velocity: Powered by regulated HPA to delivery consistent FPS on every shot, it doesn’t matter if you’re rapid-firing or in tough weather conditions.
• High-Strength SLS Nylon Construction: Manufactured with high-grade industrial nylon for extreme durability and structural rigidity without compromising on lightweight balance.
• US-Style Foster HPA Fitting: Using a standard US quick-disconnect connector for effortless integration with popular HPA lines and regulators (PolarStar, Wolverine, Redline).
• Upgraded MK2 Feed Mechanism: Re-engineered internal feed geometry ensures smooth, jam-free BB retention and feeding up to high-density BB weights (.28g–.45g).
• Universal MK23 Platform Fitment: Compatible with Tokyo Marui MK23 SOCOM, Novritsch SSX23, ASG STTI MK23, and Matrix NBB series.

Technical Specifications

What's in the Box?

• AirTac MK23 M4 HPA Adapter Assembly,
• Sealing Hardware Pack

BZ Tech Team Advice:

• Installation & O-Ring Seal: When transferring your donor MK23 magazine valve or feed lip assembly to the adapter, apply a thin coat of 100% pure silicone grease to the main seal O-ring to prevent high-pressure air leaks.
• Pressure Management: Keep your regulator setting between 80 and 100 PSI for standard site FPS limits (330–350 FPS on 0.20g BBs). NBB platforms are highly gas-efficient, so lower pressures still yield impressive range and power.
• Magazine Selection: For optimal retention and smooth feeding, pair this adapter with polymer mid-cap magazines such as PTS EPM1/EPM1-S or standard metal M4 mid-caps