Trijicon Tritium HD XR Night Sight, Fits Glock 20,21,29,30,31,32, Orange Front, 3 Dot GL604-C-600841 TRIJICON HD XR NS FOR GLK 45 ORG FRT: Building on the features of the current HD(TM) Night Sights" the Trijicon HD XR(TM) night sights are for the next level of advanced target identification and engagement at increased distances. A thinner front sight post allows shooters to have a larger field of view which further enhances the ability to identify targets" expedite engagements and see location of hits on target at longer distances.