I gave him something better. An offline gunnery terrain where he can fill the drone slots with plane or tanks then shoot at them. It even has a spawn that places him 800 from passing drones. And spawns that place his tank 2000 from drone tanks that go boom for real. You don't need special gunsights, just situations offline to practice game gunnery. The lead computing dive bombing sight will then show him how to use the historic gunsights and why there are range markers in the wirble and osti that show their max range.