Vision Products Pro Buttstock External Weight Kit Black Large. 3oz large external weight kit - by 600g / 21.2oz. This product was inspired by Vision Products Pro-shooter team which asked for a way to increase the weight of their rifle while maintaining the perfect balance point of their rifle setup. All the weights are precision-machined from steel and undergo a nitrocarburizing and post-oxidizing treatment for a sleek black finish that endures rugged use and outdoor elements. This process not only creates an exceptionally hard and corrosion-resistant surface but it also ensures that you wont have to worry about scratches or rust. For Vision Products entire product line they include Black Stainless steel screws so that you wont have to worry about any of our screws rusting after a wet day. Only compatible with Vision Pro Buttstocks. Specifications for Vision Products Pro Buttstock External Weight Kit: Manufacturer: Vision Products Color: Black Finish: Nitrocarburized/Post-Oxidized Fabric/Material: Steel Package Contents: Vision Products Pro Buttstock External Weight Kit Vision Products VISION-616-BLK: Pro Buttstock External Weight Kit Black Large