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Low PowQuality engineered for a flawlessly centered dot every time, the MBS-AA Borelight provides a precise, accurate alignment in the field without firing a single round of ammo. er Mode for Low Light Conditions. Stainless Steel Bore Rods (2) Fully Adjustable for Windage / Elevation Rotary Switch for Easy Operation. Powered by One AA Battery. Includes Arbors for these Calibers: .22/.223/5.56mm Oversize, .223/5.56mm, 7mm, .30/.308/30-06/7.62mm, .38/.357/9mm, .40/10mm/.45/.50. Submersible to 3 meters.