a-zoom .338 LAPUA Magnum Rifle Snap Caps. 2 Per Package. The firing pin releases safely and without damage in any rifle. Exact size of live ammunition. A-Zoom Rifle Precision Rifle Snap Caps are a perfect tool for adjusting and tuning your trigger pull. In addition, they help with offhand firing dry and smooth bolt cycling practice. Patented "Dead Cap" offers unlimited dry fires with no firing pin damage. Hard anodized to provide long life and smooth operation. Ideal for training, storage, and function testing.