Marck tells us why you need the Nineball HPA M4 Hi-Capa Adapter from Laylax in this video. The Nineball Hi Capa HPA/M4 Magazine Adapter is a device that enables you to power your Hi-Capa Gas Blowback series pistols with HPA (High-Pressure Air) and load them with Tokyo Marui spec M4 AEG magazines. This gives you the advantages of HPA, which is more consistent and reliable than gas, and M4 magazines, which have much higher ammo capacity than regular pistol magazines.