Rear Sight Aperture National Match
Natinal Match Rear Sight Aperture with .0595 Diameter peep. New production for use with National Match NM/2A or Standard Bases. These are for those who do not want to use the Hooded NM apertures and allow use on any sight base vs the Hodded Apertures which require special base. NM marked on face to distinguish these from standard apertures, also have taper incorporated into underside track to prevent bottoming out.