Product DescriptionThe Sightmark SM39006 Laser Boresight is precalibrated for the .300 Winchester Magnum and delivers fast, reliable zeroing without firing a single shot. Built from durable brass, this inchamber boresight projects a visible red laser (632-650 nm) to indicate your point of aim, helping reduce wasted ammunition and range time. Compact and lightweight with a simple on/off end cap, it includes batteries and a carrying case for easy transport and storage.Product Highlights Precision, precalibrated laser boresight for .300 Win Mag Visible red laser (632-650 nm) with 5 mW output for clear point-of-aim Durable brass construction; compact and lightweight design Speeds zeroing and saves ammo; 2-inch dot at 100 yards Includes batteries, carrying case, and limited lifetime warranty Specs Caliber: .300 Winchester Magnum Beam Color: Red Laser Wavelength: 632-650 nm Output Power: 5 mW Dot Size: 2" at 100 yards Sighting Range: 15-100 yards Operation: On/off end cap Material/Finish: Brass Battery Type: AG3 (3 included) Battery Life: Up to 1 hour Operating Temperature: 14-122 AdegF Included: Carrying case and batteries; Limited Lifetime Warranty UPC: 810119010056 Manufacturer Part Number: SM39006 Brand: Sightmark Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.