Double Star's Picatinny Rail Adjustable Gas block is in house from 6065 T6 aluminum and finished with a black hard coat anodize. The stainless steel adjustment screw is held in place with a brass tipped stainless steel set screw. The brass tip prevents damage to the threads on the adjustment screw. Mfg: Double Star SPECS: Material: 6065 T6 Aluminum. Inside Diameter: .750.
