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How to determine the psi in a tank when it joins with a larger tank that's empty? Answered

Ok, so I'm going to try to make this. However I want to make it so I can detach the big pvc reservoir and put on a new one for more than one shot. However, this is probably going to lower the psi when the air moves into the smaller reservoir. 

One more question: my plan is to make the air tank just screw onto the gun. Will this still be airtight? Do I need a quick release valve instead of threaded pvc?

My plan is to make the larger reservoir but put a ball valve on the end where it connects to the rest of the gun. This is so I can screw it on and turn the valve.