This Rowe Tactical Rear Slide Cover Plate for Glock Gen 1-4 is a great replacement for a plastic factory part. Rowe Tactical machines Rear Slide Cover Plates for Glock Gen 1-4 from the highest quality premium billet, mil-spec, aircraft grade, T6, machined aluminum using the tightest tolerances to give you the exact fit you require. A Olive Drab anodized hard coat gives you a component with extreme durability! Hundreds of other designs available, Rowe Tactical offers custom engraving too!