Kross Airsoft Design Glock / AAP-01 M4 HPA Adapter

If you've got a TM Glock or an Action Army AAP-01 sitting in your kit and you'd like to give it the year-round consistency of HPA running off your existing M4 mag pool, this is the adapter that makes that happen. The two pistol platforms share enough magazine geometry that one adapter design fits both — saving you from the awkwardness of needing platform-specific solutions.

Three packages cover all comfort levels. Fit Yourself sends you the kit alone and trusts you with the build. Fully Assembled is delivered fitted to a TM-spec donor mag, ready to use. The Send Us Your Mag option lets you provide a donor magazine you already own and trust — we'll perform the conversion in-house and return it skirmish-ready.

Glock vs AAP — same adapter, different feel

Both pistols benefit from HPA conversion in similar ways: cold-weather reliability, consistent FPS, full-rifle magazine capacity. The AAP-01 is more natural to build into a converted carbine. The TM Glock is the more compact option, suited to backup or sidearm use even after conversion. Either way, the adapter does the same job — constant pressure feeding from M4 mags.