Perfect for hunters, competitive shooters and law enforcement, the Sightmark 20 Gauge Boresight delivers exceptional accuracy for your 20 Gauge shotgun. At 100 yd, the device will project a 2 inches image on paper, saving you money on ammunition. 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