Haven't even got my gun yet (s400), but after a bit of shooting with Jason's, realised the need for a gadget to dispense a single pellet in a known direction (i.e. one pellet head first into the loading slot). Mainly useful for single shot guns, but could also be used to quickly fill a magazine.
3 prototypes later of varying success and I got a pretty good working model. Haven't tried it on a gun, but seems to work 100%. Just the push of a tiny lever and a single pellet drops head first down a thin tube. It holds about 25 pellets and is 20cm long and about 8mm wide (tubular). Weighs almost nothing.
Is this useful to anyone or am I missing something (maybe fine motor co-ordination ;-))