US Patent 12078453 Systems and methods for sighting firearms

A boresighting system may include a laser boresight device and a parallax mitigation device. The laser boresight device may include a casing for loading into a chamber of a firearm in place of a bolt carrier group, where the casing accepts a laser device for generating a laser beam within an interior cavity of the casing. The parallax mitigation device may include a housing for securing to an optical sight and a central position indicator providing a visual indication of a central position of the optical sight. Boresighting may be provided by adjusting an eye position to view a laser spot on a target associated with the laser beam at the central position of the optical sight based on the central position indicator and adjusting the optical sight to overlap an alignment reference provided by the optical sight with the laser spot at the central position of the optical sight.