So there I was in Bass Pro again (I really got to stay out of there) and came across this RangeMaxx Airgun Catapult normally $15 for $4.77. RangeMaxx is a Cabella's brand that is being phased out, so they told me. Hence, the discount which is also the price online.
Nothing to lose, so I took it home. Got out my trusty Barra 1866 to give it a try at 10 yards. Had to pump 7 times to get it to release. So I took the spring off and it released with only 3 pumps.
It launches an empty can up into the air about 6' high. Not terribly exciting, but I'm sure I can find alternate uses for it also.
Actually, I'm considering going back for a couple more to do a little competition with several shooters. Besides, the build is quite sturdy.