The Sightmark 223 REMINGTON/5.56MM NATO BORESIGHTER sets a new standard for precision bore alignment, delivering a reliable laser boresighter designed for fast and accurate scope mounting and head-to-head verification in the field and at the bench. This laser bore sighter enables quick chamber-to-barrel alignment across common 223 Remington and 5.56 NATO platforms, helping shooters establish a correct baseline without live fire, reducing waste and enhancing first-shot accuracy. Built with a compact, rugged profile, it integrates seamlessly with standard firearms and optics setups, allowing you to project a clear laser reference onto your target to confirm elevation and windage adjustments before shots are fired. Ideal for range safety, training, and range setup, the unit supports in-stock availability and offers dependable performance when preparing uppers or lowers for optic installation, zeroing, or rifle tuning. Whether youre installing a new scope, verifying alignment after maintenance, or performing routine bore sight checks, this Sightmark laser boresighter provides a straightforward, repeatable method to streamline your preparation workflow and improve overall shooting consistency.