Stock up on everything you need for those extended skirmishes and pick yourself a spare 31 round magazine for your Tokyo Marui Hi-Capa 5.1 gas blowback airsoft pistol. This magazine is constructed fully from aluminum with a rubber bumper to provide maximum reliability in the field. A high tension internal spring smoothly feeds BBs from the magazine into the firing chamber of the pistol, with very low risk of jams. Green Gas or propane operates this Hi-Capa magazine, which is filled through the bottom. Be prepared for whatever may come your way and get yourself this high quality magazine option from Tokyo Marui.