I did some searching when I made mine a few months ago. Mostly zone valves for sprinkler systems being used. I think the site I ended up on was antenna launchers or something of the sort. Easy enough to do, just too bulky and slightly delicate.
Edit...
No recoil that I've felt. You do need to open the valve as quickly as possible. This is about the only accuracy compromising part. I am more accurate with this than the big shot.
For the shipping and the customs BS, make your own. I made mine and it works great. Not to take anything from Nick, but it is just a few simple components.
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