Since hiking the Apalachia locations, central Indiana woodlands, Rockies, Smokies, etc., doing the whole survival thing for real, the idea has been on the brain. If one doesn't do those things, such a gun is more a novelty than anything else. However, regardless, such an air tool would be fun to have. My thoughts, as follows.
Weatherized metal for the worst of conditions, i.e. salt water protection;
self contained, pumper perhaps;
.22 cal minimum;
ability to take completely apart with no tools;
Absolutely no use of inferior metals in the valve;
Complete oring designed system - even for the exhaust seal;
The ability to fold in upon itself to be compact;
compartment to carry extra pellets, orings, spare pins;
The perfect dinner get'n tool.
"The majority of things in our lives are created by folks no smarter than the rest. Afterall, the world is comprised, and operated by C average people intellctually, academically, and morally. These people are often the great pioneers that set the precedent for what excellence should be."