These weighted 12 gauge shotgun snap caps (dummy rounds) have the same feel and weight as a live round which makes them perfect for practicing reloads for competitive shooting events, like 3-Gun. A spring loaded striking area cushions and protects the release of the firing pin which makes these an excellent tool for teaching and eliminating flinching as well. Prevents damage and prolongs main spring life Precision machined to true SAAMI specs Primer material is correct hardness to prevent striker/firing pin over-protrusion Aluminum won't damage the chamber/extractor/ejector Snap caps are a critical training aid for learning how to fix malfunctions quickly and efficiently not only for competition shooters but for anyone who has a gun for self-defense