Don't know if it's already known, but I've notice in 6:36 of the gameplay breakdown of the watchtower that if you have the gun activated, you can choose what kind of movement level you can use. In the video, the gun was at level 3, but the guy of the stream activated the level 2 grenade, and the gun automatically went to level 1. That's amazing. So you don't need to do the movement of the level your gun has and, of course, you can actívate the level 1 three times in a row, if you have level 3. This opens more creative uses of the gun.