AMERIGLOA(R) Optic Compatible sets provide a precise, elevated co-witness sight picture for slide-mounted red dot optics and serve as reliable back-up sights. These 3XL height sights from Ameriglo are optimized for the Glock Gen4/5 MOS Slide for use with Holosun 407C/507C/508T, Trijicon, RMRA(R)/RMR HDA(R), RCRA(R)/SROA(R), EOTech EFLX optics. These sights will allow for use through the optic window. SPECS Fits Make: GlockA(R) Fits Model: All Glock MOS Models (excluding 42, 43, 48) Size: 3XL Fits MOS Slide: Yes Front Sight Style: Tritium Front Sight Finish: Case Hardened Front Tritium Color: Green Front Outline Color: White Mfg: Ameriglo