Precision Armament Rail Blank 7075 Aluminum 9-Slot 4.0in Satin Finish. Fully CNC machined to MIL-STD 1913 picatinny dimensions from a billet of high strength 7075 T6 aluminum alloy; delivers superior strength straightness and precision compared to extruded picatinny rail blanks. Manufactured to the same tight tolerances as our finished rails. Picatinny rail blanks feature full cross slots and finished pre-radiused ends which are often difficult to machine on square stock - offers a professional finished look that won't snag on gear. Specifications for Precision Armament Picatinny Rail Blanks: Manufacturer: Precision Armament Color: Grey Finish: Satin Fabric/Material: 7075-T6 Aluminum Gun Rail: Picatinny Country of Origin: USA Package Contents: Precision Armament Picatinny Rail Blanks Precision Armament A11001: Rail Blank 7075 Aluminum 9-Slot 4.0in Satin Finish