The ruger-57 optic adapter plate supports the use of jpoint mrd.& shield rms red dot sights on the ruger-57 pistol.The plate is precision cnc machined from 6061-t6 aircraft aluminum with a matte black hard coat 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).Note: the extra screws provided in the package are meant for installing the jpoint sight only.Shield sights should fit this base without modification.The adapter plate is 1.700" long x.975" wide and weighs 0.02 ounces.This genuine ruger factory accessory is made in the usa.

Adaptor Type: Optic
Finish: Black Hardcoat Anodized
Style: 1-Piece
Material: 6061-T6 Aluminum
One Or Two Piece: one piece