Hold mouse to charge, space bar to fire, R to reload. It has a 10% chance to jam. This gun actually can switch between single fire, burst, and full auto in real life, but I did not want to make that much.
Traced a picture of my Nerf Regulator and recorded myself using it. Thanks to zetoban for the song. https://www.youtube.com/watch?v=NMxF_0UMwIk