XS Sights GL0004S5: The XS Sights DXT Big Dot sights have a large front sight to improve speed of front sight acquisition, V-Notch rear sight that provides a large field of view for greater target identification, and a snag free design for easy draw from holster without catching clothing. This suppressor height sight will work with suppressors up to 1.375 in diameter and fits Glock 17/19/22-24/26/27/31-36/38 firearms.