SillySledge - SledgeFire to Silly Shells

First thing I did is make a groove to slot in the cut-off muzzle from the old barrel into the new barrel. now no gaping hole in the front! Looks smooth! NICE. I moved the breech a little closer to the bolt face for a better seal. I also made it flush with the breech face (for aesthetics). The Breech face (the round orange coin thing with a hole in the middle) is one millimeter thick. Next, cut a piece of 1 mm thick cooking sheet silicone to 30-33mm outer diameter, 13-20mm inner diameter hole. Super glue it to the orange thing, and you have a perfect seal.The next thing I did was cut out a piece of packing foam (not the white crumbly stuff, the durable foam that is made with firm plastic). I cut the foam around 15 mm tall then pushed the air tube from the SledgeFire into the foam and twisted it to cut it out. Then I made sure to punch a hole in the middle for the air to come out. I found a tube that was the same inner diameter of a nerf dart and thin enough to twist and cut the foam. I