I'm thinking you could cut that down a lot if you used a custom twist-open feed instead of plugs, to combine all of the operations instead of just the tube operation. Think standard twist open feed, except instead of turning each one individually, they are notched and there is a gear in between which you turn to twist both gates into the "open" position at the same time.
Also, instead of on the sides, put both spring follower slots on top, at 11 o'clock on the right barrel and 1 o'clock on the left. The look loop at the muzzle end has to go either both to the right or both to the left. Link the two pins with a thin delrin block/plate/sled, and put the front sight pin on the block. As you're firing, your sight pin moves closer toward your face (indicator of how much paint you have). Obviously way more complicated to build but I think it's definitely possible.
Reload process would be:
- Grab front sight pin, push forward and twist to lock both springs into place at once
- Grab rear knob and twist, to open both feedgates
- Dump in two tubes (taped together)
- Twist rear knob to close both feedgates
- Release springfeeds
Ghetto pic:
