This is a ballistic computer exercise. The prototype is fn ballistic computer. I have to say that the original design is so accurate, my work can only be called an exercise.
I really hope this thing can be integrated into the fps play, so I anticipated some scenes, and I think this prop can really change the play of the game, and maybe one day the previous design will also enter a game. Use different props such as computers to make your battle more strategic rather than competitive.