gorilla 39Limited to 500 pieces, the 39mm Nero Aurelia features a black dial with rhodium-plated hands, aluminum flange, and Viton rubber strap. Viton™, titanium pin buckle. Super-LumiNova™ filledCheck out our special Gorilla Machining Mikhail AR-15 7.62x39 Barrel up. There are barrels of differing sizes and lengths that you can install easily on your rifle. Discover your perfect barrel