A-Zoom .338 Lapua Magnum Rifle Snap Caps. 2 Per Package. Release the firing pin safely and without damage on any rifle. Exact size of real ammo. A-Zoom Rifle precision rifle snap caps are a perfect tool for adjusting and tuning your trigger pull. In addition, they help with offhand dry firing and smooth bolt cycling practice. Patented "Dead Cap" provides unlimited dry fires with no firing pin damage. Hard anodized to provide long life and smooth functioning. Ideal for training, storage, and function testing.