a Recoilles springer

[cringe]

Hi, i have this idea & thought I might " run it past you", Has this been done before? A combination recoil less, spring'er/pneumatic. I imagine a design similar to Webley Mk2, the gun is cocked & then " dry fired" but the compressed air is not released, it would be stored in a reservoir behind the breech [would have no-return inlet valve]. OK? now I imagine the mechanisms of a Sheridan, after loading [which could be done at the cocking stage], trigger releases hammer, strikes exhaust valve, result ; zero recoil? Disadvantages? - might end up a bit heavy? it would need a complicated double release trigger mechanism? Any way's some "food for thought" & feel free to comment. Kind regards Al.

PS. should have been recoil less, should have gone to specsavers!