Speedsoft adapter for HPA and M4 AEG magazines on your Hi-Capa airsoft pistol. Each adapter is 3D printed in the USA using high quality materials. I will warranty all parts for 90 days.Designed with perfect angles for quick magazine changes.– Use standard AEG m4 magazines in your Hi-Capa pistol– HPA powered, suggested 100-125 PSI– BB retention system to prevent wasting ammo.