My son and I built some Hexbug VEX Robotics weapons - a propeller launcher and a Gatling dart gun. The propeller launcher is pretty cool on its own, but the Gatling gun… it’s terrifying. Its rate of fire is ridiculously high, and the soft-rubber-tipped projectiles have a surprising amount of velocity and stability in the air. I gave it to my daughter, the junior fishspawn, and after the initial surprise, she cackled as she fired it into our glass back door.