Perfect for hunters, competitive shooters and law enforcement, the Sightmark 20 gauge boresight delivers exceptional accuracy for your 20 gauge shotgun. At 100 yards, the device will project a 2-inch image on paper, saving you money on ammunition. Includes a carrying case, three AG3 batteries, and instructions
Specifications:

Type	Laser Boresighter
Caliber	20 Gauge
Style	Cartridge
Material	Brass
Quantity	1
Battery	AG3 (3)
Mount	Chamber