The BS204 by AimShot: Enclosed in solid, resilient brass housing, AimShot\'s boresight employs a 640nM wavelength across the board to ensure pinpoint precision with no need for adjustment. It smartly operates on button cell batteries for all enclosed chamber functions. Moreover, its flexible design allows retrofitting with a battery pack to massively extend battery life from a mere 10 minutes to more than 20 hours.