This expert review from Brass Facts assesses the Surefire M640 Turbo, a weapon-mounted light designed to reclaim Surefire's market dominance. The review highlights its impressive 100,000 Candela and 700 lumens output, competitive pricing, and the new Surefire Pro Mount system. It details performance comparisons, battery options, and practical reliability testing over 2,500 rounds, concluding that Surefire is back in the game with this offering.
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