1 Million B.C. is a carnival rifle range type game and was produced by Midway Manufacturing Co. in 1968. The machine works by electro-mechanical contacts. The gun has an electronic board underneath, while the targets have their own boards. As you aim, and the target moves, when the trigger is pressed, if your gun is hitting the correct circuit, and the target is on the same circuit.. BANG! you hit your target. This machine gives you 25 shots to score your best game. It also lets you beat the games (random) high score for a free game.