Magpul Industries Bipod fits A.R.M.S. & 17S Style rails 

The Magpul Bipod offers serious strength and versatility at a price that provides unmatched value. Rich with important features, Magpul's lightweight Mil-spec hard anodized 6061 T-6 aluminum and injection-molded polymer bipod brings innovation in ergonomics, functionality, strength and value together. An aesthetically pleasing, low-profile design conceals its mechanisms and hardware, smoothly brushing off snags and bumps. Optimized for rapid one-handed adjustments, the bipod quickly and quietly transitions between countless user configurations. The Magpul Bipod includes many features normally found on bipods at a significantly higher cost. Fits A.R.M.S. 17S style rails.