Ruger 57 Optic Adapter Plate (Docter/Meopta/EOTech), Black Finish, Fits Ruger-57 90722 This Optic Adapter Plate supports the use of Docter, Meopta, EOTech, Insight, Noblex red dot sights on the Ruger-5.7 pistol. Also fits the TruGlo Tru-Tec Micro TG8100B. The plate is precision CNC machined from 6061-T6 aircraft aluminum with a matte black hardcoat finish for strength and durability. Simply place the adapter plate onto slide and secure it using the two #6-32 screws provided. Tighten the screws firmly (30-50 in-lbs.) using a Torx T-15 wrench (not included). Install the optic onto the Adapter Plate by following the sight manufacturer's mounting specifications (sight not included).