SUREFIRE X300U-B 1000 Lumen
Surefire X300u-B Weaponlight, Pistol and Picatinny Mounting, 1000 Lumens, 2x 123A, Black X300U-B
The -B at the end of this Surefire model designates that this light uses the screw mount, as opposed to the clamp-mount.
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