First, you need to know a little about how everything works if you don't know already, if you do, you can skip this step and go on the next step (Materials).
QEV (quick exhaust valve) - A QEV allows the user to control when they want the air coming from the input port to be released through the output port by using a pilot. In other words, coming in from the input port would be the compressed air which is inside the chamber, then using a pilot to open the QEV, the compressed air in the chamber is released through the output port.
Pilot (blow gun) - A pilot is what will open the QEV to allow the compressed air from the input port to exit through the output port. In my case, my pilot is a blow gun.
Blow Gun - A blow gun is a pistol type pilot which allows the user to press a trigger to open a hammer valve which opens the QEV.
Bolt Action - A bolt action system allows the user to open a section of the barrel and insert a projectile (in my case, BB's). Once the projectile is placed in the barrel, the user can close the section of the barrel by returning the bolt to it's locked position, therefore securing the ammo inside the barrel so that it can't get out.
Alright, that's pretty much it for the schematics of the gun, the rest is just how you position everything and how you connect everything so that each part functions with each other.