To load a percussion cap gun, you pour gunpowder into your breech, things the projectile in on top of it, and place a mercuric fulminate cap along with a small nipple. Once the cam roller slides ahead, it pushes the feed cam to the best towards a return spring. https://shootamachinegun11863.laowaiblog.com/33186254/fn-fal-things-to-know-before-you-buy