MDT picatinny scope rails are machined from aluminum stock to be precise durable. The 20MOA rail is the industry standard for hunting rifles PRS rifles or generally long-range shooting. They are machined from 6061-T6 aluminum then hard-anodized black for a durable finish. The underside of the rails are profiled to allow the rail to be mounted flush on the receiver and to match the geometry of the ejection port. These rails are designed with a 20 MOA incline providing additional elevation adjustment from your scope. *A recoil lug has been integrated in the underside rail profile on models where the actions design allows for this feature.