This is a button/switch in the general shape of a Claymore mine detonator.
It uses a guitar pedal stomp switch for a satisfying click.
I put a 3.5mm connector on it so it can be used with devices like the Xbox Adaptive Controller or HID Remapper, but you could conceivably fit a whole microcontroller inside and make it into a standalone USB device.
It uses four M3x14 flat head screws.
The author marked this model as their own original creation.