Simon, make us a simple, reliable, tough, mechanical 50 caliber semi-auto that field owners can use as a rental (and others can buy also). Fairly light and small as it will be used by many younger players and women. No fancy rails and stuff; make it easy to wipe down. Easy maintenance is also a must. The Spyder Opus actually fits the bill pretty well except for the reliability aspect. Tippmann did it with the 98 in 68 caliber (except for the easy maintenance). If you culd make it so the velocity could be dialed right down to about 200 fps, that would be a bonus. There is a Demand both here and in the rest of the world that is not being Supplied.