Rival Arms RA43G004A Slide Back Cover Plate Double Stack Black Anodized Aluminum for Glock 17/19 Gen5
https://www.tandktactical.com/shop/788130030271-rival-arms-ra43g004a-slide-back-cover-plate-double-stack-black-anodized-aluminum-for-glock-17-19-gen5-24384
https://www.tandktactical.com/web/image/product.template/24384/image_1920?unique=c48a13d
This Slide Back Cover Plate is CNC machined from aluminum with a black anodized finish.
