Surefires, although expensive (and yes you have to use the 3v batteries) are by far the most durable and dependable lights out there. I had one strapped to my M4, a smaller one in my pocket, and then the helmet light on my kevlar.
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Taurus PT111 Pro 9mm Para Arms *custom* P14-45 .45cal Springfield 1942 M1 Garand Remington 700 SPS Tactical .308
If you ain't Cav... You ain't $h/t!
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