Airtac KWA / KSC / ASG MP9 to M4 HPA Adapter - Non-Prebuilt

Convert your MP9 platform to feed from M4 magazines with a printable, non-prebuilt adapter designed for KWA, KSC, and ASG MP9 builds. It reproduces the short MP9 magazine profile and requires installation of MP9 feed lips, valve, and gas router (sourced from a short or long MP9 magazine) to create a reliable M4-compatible HPA feed path.

• Compatibility: Compatible with most airsoft M4 magazines; requires MP9 feed lips, valve, and gas router installation. Components can be sourced from either a short or long MP9 magazine to complete the setup.
• Printed MP9 Magazine Replica: The design replicates the short MP9 magazine so you don’t need to source a separate magazine, simplifying your build and ensuring a familiar feed profile.
• Rear Shim Adjustability: The rear shim is fileable and replaceable, allowing precise alignment with your M4 magazine and MP9 gas system (as shown in the included image).
• Performance-minded Configuration: For higher ROF builds, pairing with EPM1/EPM1s magazines is recommended due to their stronger springs. Note that 2–3 BBs may drop during mag swaps in certain setups, highlighting the importance of careful tuning.
• Installation & Customization: Requires integrating MP9 feed lips, valve, and gas router. This non-prebuilt approach gives you a customizable HPA feed path tailored to your specific KWA/KSC/ASG MP9 chassis and preferred M4 magazines.

With this adapter, MP9 users gain access to widely available M4 magazines while maintaining precise control over gas flow and feed timing. It’s an ideal solution for builders seeking a compact, high-performance HPA setup without relying on a dedicated MP9 magazine, offering tangible flexibility for field-ready configurations and personalized tuning. The included fileable rear shim facilitates a snug, reliable fit, and the option to source feed lips, valve, and gas router from either short or long MP9 magazines helps you tailor the system to your playstyle. This is a non-prebuilt, DIY-friendly adapter crafted for experienced enthusiasts aiming to optimize reliability and ROF in MP9-to-M4 HPA conversions.