Aimshot's boresight is made with a solid and durable brass housing and utilizing a 640nm wavelength throughout the line that guarantees zeroed in and requires no adjustment.It runs on button cell batteries for all closed chamber operations but, can be retro fitted with a battery pack to increase battery life from 10 minutes to over 20 hours.Type: Laser BoresighterCaliber: 30 CarbineStyle: CartridgeMaterial: BrassQuantity: 1Battery: LR41Mount: Chamber