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Overview: The laser unit cartridge fits 223REM caliber rifles. It projects a straight laser beam allowing precise optical adjustments to sight in your scopes & sights without firing and ammo. Great for the range and ensuring your gun is still zeroed in after travel. Specifications: Compact size Laser output: <5mw Wave length: 635-655NW Package Contents: 1 x Laser Bore Sight 233 REM 4 x LR41 Batteries