Sightmark .223/5.56x45 Boresight

The Sightmark .223/5.56x45 Boresight (Model SM39001) delivers a laser-based zeroing solution that eliminates the guesswork from rifle sighting without firing a single round downrange. This laser boresight chambers like standard ammunition and projects a visible dot indicating precise point-of-aim, enabling operators to establish preliminary zero before conducting live-fire verification. It's the fastest method for bringing rifle optics into alignment before validation shooting.

The boresight's .223/5.56x45 NATO compatibility makes it applicable across modern rifle platforms using the 5.56 intermediate cartridge. At 0.13 lbs and measuring 5 x 1 x 8 inches, it's compact enough for range bags and vehicle storage. Chamber operation mimics live rounds, ensuring the laser beam aligns with actual bore geometry rather than relying on external mounting or scope rail attachments that can introduce parallax error. Once preliminary zero is achieved through the laser reference, ammunition-specific variables—velocity, powder lot, projectile weight, and environmental conditions—are fine-tuned through conventional range work.

This tool serves competitive shooters preparing rifles for match day, hunters validating new ammunition lots before hunting season, and law enforcement units conducting duty-rifle maintenance and qualification readiness. The boresight approach reduces ammunition expenditure during initial sighting and accelerates the setup process for personnel rotating between duty rifles or testing new optics. Because bore-based laser alignment eliminates scope-mounting variables, it's particularly valuable for diagnosing whether apparent point-of-impact shifts stem from ammunition differences, shooter technique, or optical failure rather than mechanical zero loss.