These cartridge laser bore sights come in many different gauges and calibers.They have a brass case and a 5mw red laser.
Type: Laser Boresighter
Caliber: 223 Rem
Style: Cartridge
Material: Brass
Quantity: 1
Battery: LR41
Mount: Chamber
Type: Laser Boresighter
Caliber: 223 Rem
Style: Cartridge
Material: Brass
Quantity: 1
Battery: LR41
Mount: Chamber