Sightmark SM39006 Boresight 300 Win Mag Red Laser - Brass

The Sightmark SM39006 is a 300 Winchester Magnum in-chamber laser boresighter designed to get your riflescope or red dot sighted in fast without burning through a full box of ammunition. Constructed of durable brass and pre-calibrated at the factory for the 300 Win Mag chamber, this compact boresighter drops into the rifle's action and projects a visible red laser downrange so you can dial in your optic's windage and elevation before you head to the range.

The laser operates at a 632-650 nm wavelength with an output under 5 mW, delivering a bright, easy-to-see reference point for your optic at typical indoor and outdoor sighting distances. The brass housing is compact and lightweight, slips into the included carrying case, and the unit is powered by three AG3 button-cell batteries (included) for approximately an hour of sighting time. Using a boresighter like the SM39006 dramatically reduces wasted ammunition by getting you close to zero before you fire a single round.

This boresighter is purpose-built for the 300 Win Mag cartridge and is not a universal fit. Whether you are sighting in a new hunting rifle, swapping optics between rifles, or dialing in a long-range scope, the Sightmark SM39006 is a fast, simple zeroing tool for the 300 Win Mag shooter.