B-Square no gunsmithing semi-auto pistol mounts integrate with the pistol's original components to assure optimum performance with every trigger pull, superior to any grip" mounted system. Rimfire "Sight-to-Sight" custom mounts use existing screw holes for a rock solid foundation. All B-Square mounts provide full-length ring rails for maximum eye relief adjustment. Browning Buckmark- 5 1/2"+ barrel (receiver mount): Attaches by removing two screws and replacing rear sight base.