These A-Zoom precision metal snap caps are designed to allow you to safely release the firing pin safely and without damage to your rifle. Snap caps are the perfect tool for adjusting and tuning your trigger pull, practicing dry firing, and bolt cycling practice. Snap caps are good for hundreds of primer strikes and they are precision CNC machined in the USA.Features: A-Zoom Precision Metal Snap Caps 12231 .45-70 Government Practice Loading/Unloading firearm safely Dry fire your firearm without causing damage Made to exact size of real ammo Precision CNC machined in the USA