Would be fun to do "smart clays" -- I wonder if you could make a clay which just shifted weights to affect flight path, something cheaper thna a full drone. Or you could fly a $300-500 non-expendable but not-end-of-the-world-if-hit drone trailing a target on a long tether, with no-shoot above a certain angle to keep the drones themselves mostly safe?
(and yeah, I have an M4 and 3 Turkish knockoff M4s (1 great out of the box, one I fixed up, one which doesn't love to eject but I can probably fix), and the 2 x 1301s I own are better.)