Crazy paintball brainchild

Hello! I came upon your slice of the internet while looking for somewhere to get some help with a brainchild I've been entertaining in my head.

Basically, it's a paintball gun. But not any paintball gun, it's a paintballl gun I'm building because I'm tired of the standard spray and pray method of paintball. I want something more skillful. I want a shotgun! Specifically, a lever action, tube-fed one that I can load with custom types of shell-loads.

In theory, it can work. Combine the mechanics of a lever action with the pneumatics of a paintball gun. I've figured out a way to build the lever action, thats easy metal work. What I can't figure out is an effective way of making the air flow from the tank to the barrel, while keeping it in the spirit of a lever action.

The lever action part is easy. #-Link-Snipped-# has a great animation if you don't understand how they work. The pressure part is whats holding me up. It needs to operate in a way that keeps it sealed, but still functionally powerful enough to push out what is essentially a paintball buckshot, and be able to reload itself each time. The idea I'm running with at the moment is basically to put a valve in the way that locks in place when the bolt goes backwards from the lever being pushed forward, and releases when you pull the trigger. But I'm not sure if its possible, or how it would need to be designed for it to work.

So I've come here, hoping for someone to offer some words that will either be the solution, or inspire one in me! I'm sorry for the vague post, I'm not sure what else you might need, so I'll list some links to pictures that helped me get to where I am now.

Spyder paintball gun animation;
#-Link-Snipped-#

How a lever action works;
#-Link-Snipped-#

A pump action paintball gun animation;
#-Link-Snipped-#

Thanks 😁