Specification :

RAP4 3000psi refillable compressed air tank comes with a 3000psi Refillable Cylinder and stock. This is another great option for Law Enforcement and Military agencies. This system allows agencies to use compressed air that most agencies already have at their station or at their local fire station. This system makes it easy for agencies to gain access to air and not have to pay ongoing operation costs for disposable cylinders.

This system makes it easy for departments to train. It has a built-in refill valve that can be attached to refill the cylinder without having to remove it from the marker. It makes refilling quick and easy. It takes less than a minute to refill. This configuration allows the agencies to train continuously without downtime and it allows more trainees to pass through the training lane.

This configuration also allows you to attach a remote line directly to the refill adaptor while having the air tank inside the stock. You can use both the air in the stock and a remote line as backup.

More info,pls visit:
http://www.rap4.com/paintball/os/page2.php