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Sightmark Red Laser Bore Sight Specifications and Features: Sightmark SM39001 .223 Remington / 5.56 NATO Bore Sight Laser Wavelength 632 - 650 nm LED Type Visible Red Laser Output Power 5 mW Battery Life 1 hour Range for Sighting 15 - 100 yards Dot Size 2 in @100 yards Operation on/off end cap Material Brass Operating Temp 14F to 122F Precision accuracy Reliable and durable Fastest gun zeroing and sighting system Reduce wasted cartridges and shells Compact and lightweight Easy to pack and travel Runs on Three AG3 Batteries