Tested and recommended by the National Tactical officers Association, the Sightmark .40 S&W Boresight Offers a quick and easy way to sight in your .40 Smith & Wesson pistol. The bore sight can be used as a training aid for "quick draw" drills. Includes a carrying case, (3) AG3 batteries and instructions. Features: Precision accuracy Reliable and durable Fastest gun zeroing and sighting system Reduce wasted cartridges and shells Compact and lightweight Easy to pack and travel On/off end cap operation