Precision Reflex Ruger Preditor BAR Rail Step DN Night Vision w/ 6-48 Screws Black. This base is constructed of T-6 7075 hard coated black anodized aluminum with a full 1913 rail. Base is 16in long and comes with #6-48 screws for mounting base. The base has side rail mounting holes for adding side rails in the future (not included). Weighs 10.4 ounces. Rear elevation is .740in and there is .280in of drop from rear to front rail. Specifications for Precision Reflex Ruger Preditor BAR Rail Step DN Night Vision: Manufacturer: Precision Reflex Color: Black Finish: Anodized Fabric/Material: Aluminum Quantity: 1 Cant: 0 MOA Gun Make: Ruger Gun Rail: Picatinny Package Contents: Precision Reflex Ruger Preditor BAR Rail Step DN Night Vision Precision Reflex 02-215-08: Ruger Preditor BAR Rail Step DN Night Vision w/ 6-48 Screws Black