I made a small RC Lego Technic tank (or SPG) that can drive around and shoot 1×1 Lego liftarms as projectiles. Enjoy!

0:00 Hammer mechanism
00:33 6-round magazine
01:55 Motors and tracks
03:36 Decoration
04:06 Radio control
04:52 Final showcase

The tank is powered by Circuit Cubes Cubit motors (3x) and a Bluetooth Battery Cube.
Cubit Motor Cube
Bluetooth Battery Cube

The controller is 8BitDo SN30 Pro G Classic and the intermediary app is BrickController 2 (Android).
https://www.8bitdo.com/sn30-pro-g-classic-or-sn30-pro-sn/
https://play.google.com/store/apps/details?id=com.scn.BrickController2