Sig Sauer MCX/MPX Folding Pivoting Contour Brace. This folding firearm brace is constructed of high-quality aluminum with a steel foldable attachment knuckle. With the appropriate adapter, this genuine Sig Sauer accessory easily installs onto the rear end of the Sig MCX or MPX platform firearm chambered in any caliber including .223 Rem, .308 Win or .300 Blackout. The brace provides a solid stabilization to improve accuracy through the use of the adjustable nylon strap located on the pivoting clamp style polymer brace. Installed on the rear adapter via a 1913 standardized clamp, the stock / brace does not impede normal operation of the firearm when folded. This brace is made to the same high standards as the parts already found in your Sig Sauer firearm. Genuine Sig Sauer accessories are designed around the same relentless standards put into every pistol and rifle Sig makes. Kit up, dress up or service your Sig Sauer with original quality parts and accessories.