Snap caps serve several important roles in the world of firearms training. Many people prefer not to drop the firing pin on an empty chamber. After being chambered in a firearm, snap caps keep that from happening. They feature the same dimensions as standard ammunition, but they are totally inert and contain no gunpowder, bullet, or primer. With snap caps, you can practice reloading your magazines and chambering rounds in your firearm. They work great for checking or adjusting the weight of your trigger pull. If you prefer to release the tension on the hammer springs when storing your guns, snap caps are great for that too.