The 40 S& W Red Laser Boresight from Osprey Global features brass construction and a precision-calibrated laser dot that's projected down the barrel and gets within 1.5" of the center. The laser wavelength is 635-655nm and the laser beam is < 5 mW. The dot size is 1.5" at 100 yards and the sighting range is 15-100 yards.
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