Converting to High-Pressure Air (HPA) is the ultimate tactical upgrade for your Gel Blaster. Put the sting on your opponents with the most powerful upgrades available. A good HPA kit can give you a seriously OP 400 fps - 500 fps blaster! If you need the most highest powered gel blaster possible, nothing can beat Azraels Armoury's HPA Gel Blaster parts, kits & accessories.