A-ZOOM SNAP CAP 270 WIN 2 PK A-Zoom metal snap caps protect your weapon from spring fatigue and damage to your firing pins from dry firing. Snap caps allow you to release your firing pin without damaging your gun. You can practice sight control, trigger squeeze, and check the weapon's cycling as well. Stock up and get all the calibers you need today. A-Zoom snap caps are precision CNC machined to fight the exact size of the ammo for your gun.