Have you thought of integrating the barrels of a Triad or Messenger? That way, you'd have at least three shots, and also solve the air flow problem. From the pictures, it looks to be a similar plunger volume.
Your check valve in your pump is probably broken, as discussed in here. http://nerfhaven.com...l=&fromsearch=1
I know there's another similar thread somewhere that linked to a website that provided free samples, and someone with this same problem was able to solve it that way. Maybe you'll have more luck finding it than I did.
I always use tacky glue to fix any rips in my darts.<http://www.amazon.co.../dp/B00178KLEY>
This isn't the specific brand I use, but it dries fairly strong and flexible. As for dart heads, I haven't had much luck with this to reattach them, but for tears in the body it works well, without destroying your foam or weighting the dart to one side.
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