Well, yes that is an option. Problem with reducing the mass of semi-automatic handguns is many of the parts that are held are doing double duty for the user interface (grip, magazine holder). By the time you strip it down much of it needs to be custom fabricated. Suddenly it is no longer an off-the-shelf build. Sights are very little weight. Maybe stripping a rifle would get the results you are indicating.
The point is have you looked at quadcopter control boards recently? Every control board has active stabilization, and can be set to a mode that is very stable. This will hold level fairly well. Add GPS and it will hold position in all axis. Add a FPV camera and use a bore laser to aim, simply put a mark on the monitor on the pilot/shooter's end and it will be good for 25 feet range without second thought, probably much longer range but that would require test firing. Add a tilt servo if desired otherwise the firing line is locked in, and 5 or 10 degrees of up/down adjustment would make aiming potentially easier.
All the electronics are off the shelf to do this There is nothing special needed, no special programming skills. No electronic wizardry other than using a soldering iron, and that can be avoided even by choosing components with connectors already installed. _ALL_ the fabrication can be done with a saw and drill, even the gun rest and (optional) tilt mechanism. More robust material than hardware store square dowel would be needed, so aluminum, fiberglass, or carbon fiber square tubing with PCB, fiberglass, or CF sheet, and a couple boxes of nuts and bolts. These are all easy to get materials.
The hardest thing with I see with this build is keeping the machine close to balanced AND having the thrust line of recoil pass through the center of gravity. Both are trivial design problems.
I would not try this myself, well, maybe for paintball but that seems silly.
As a proof of concept, someone building this kind of machine, I am still surprised this was not seen a few years ago.