EDEMO Agency Arms Holosun 509T Dovetail Forward of Optic Agency Optic System AOS Optic Plate for Glock Black G-AOS-509TDTF EDEMO1. Agency Arms G-AOS-509TDTF: Holosun 509T Dovetail Forward of Optic Agency Optic System AOS Optic Plate for Glock Black