you probably haven't seen alot of detail in this thread because there is a seperate thread for air systems.
to answer your question tho, air tanks are measured by PSI for volume instead of weight like co2 is. Co2 conpresses to liquid there fore is meetered by the weight added to the tank. (20 oz co2 tank)
HPA is different because it does not compress to a liquid form. So the volume contained is described as follows. size of tank (45 ci, 68 ci, 88 ci) then the PSI cappacity of the tank is listed (3000 psi, 4000 psi, 5000 psi)
So you can see that a 68 cubic inch tank compressed to 3000 psi would hold less air that the same size tank compressed to 4500 psi.
a simple rule of thumb for shots per tank is as follow, 10 shots per ci for 3000 psi tanks. and 15 shots per ci for 4500 psi tanks.
now onto the regulator. the regulator is what regulates the output pressure from the tank to your gun. If the regulator was not in place the tank would vent the storage pressure. there are basicly 3 types of regs. LP (low pressure) that the output is set to 300 to 450 psi. HP (High pressure) output is set to 800 to 850 PSI. or adjustable.
on an autococker the operating pressure of the marker (stock) is around 450 psi. so a HP tank is the best solution becuase then the tank is feeding the inline regulator enough pressure and volume to allow it to recharge fast enough to feed the marker w/out starving it.
This should give you a nice overview of how the air system works, you should be able to do some more research on any follow up questions you may have in the
AIR SYSTEMS section.
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