Air system Questions? i need help

you should have done a search!! it isnt filled on a normal air compressor because they dont generate enough pressure. you need to buy a hpa tank. you can run both nitrogen and compressed air in them. they make them steel for cheapest which is pretty heavy, aluminum for a little more expensive and medium weight, and fiber wrapped which is the most expensive of the three and is the lightest. also the steel tank is the most durable where the fiber wrapped is less and you may need to look into buying a cover to protect the fiber. alot of guns can operate on high pressure and you can just screw the tank right in but some cannot. low pressure kits just increase the guns efficiency, reduce recoil, and make your shots more consistant.