Guns MOd comes with a custom user interface for each weapon and an advanced weapon system including things like ammunitions and unique crafting recipes for each weapon.
More than 40 weapons are included in the mod. Everything from handguns to massive rocket launchers and handheld throwable items like grenades and molotovs.
First of you need to craft a weapon. Most of the weapons are crafted with redstone, iron ingots and gunpowder and the specific ammo based on what weapon you want to craft.
Different weapons use different user interfaces.