This is my breach load system for the main gun in my tank. I only post this because I haven't seen anybody do this.......but I may be mistaken
Excuse all the other crap this is the third gun set up and there are a few pieces left over...
I started out with a section of 2"pvc. I cut a hole in the side about an inch from the bottom, just big enough for a nerf to fit in.
Then I got a section of exhaust pipe that would fit snugly over the pvc. cut a hole to match the pvc. and welded a end cap on with a 3/4 pipe fitting on the end for the air to enter.
I also cut a groove in the pvc around the hole to put a square cut o-ring in to help seal between the pvc and exhaust pipe.
Now just slide a nerf in and twist the metal pipe and fire. With 30 psi I get over 300 feet at about 30 degrees.
This photo you can just see the yellow o-ring
I fill this tank off the main tank (5gal.) or off a co2 bottle.
I used this set up because I messed up the gun mount and I don't have much room when the gun is elevated or when I turn the turret.
Anyway hope it comes in handy for someone else some day.
Happy hunting !!