That would be awesome. Only springer I own is an underlever. I love the fixed barrel accuracy. couple things I would want...
1. nitro piston
2. no plastic on the underlever catch. B40 has a solid simple design.
3. like the bolt action idea, but would have to be better than the cfx loading port.
4. wood and metal
5. shrouds are nice too, but not at the expense of lots of extra weight. (My b40 is a little front heavy.)
6.700 fps in .22
7.M-rod trigger or same quality.