Here is a video manual from TAGinn/Airsoft Pyrotechnics showing how to use the Launcher – “Shell HPA”... "'Shell-HPA' is for high pressure air use ONLY. It must be filled from the regular 850PSI regulated HPA paintball tank, using the upper part of the 'FiSt-2'. This device will throw the projectiles as far as our shell-less grenade launcher TAG-ML36 upgraded with HPA extension kit.

The air temperature and humidity won’t affect the velocity and ballistics of the shot anymore. The similar ballistic of TAG-ML36 launcher and 'Shell-HPA' will allow you to use TAG-ML36 aiming device with any other grenade launchers."