The Sig Sauer MCX/MPX PCB Kit with Folding Brace is a premium accessory designed for seamless compatibility with the Sig MPX or Sig MCX. Engineered for quick and easy installation via the receiver's 1913 interface this factory kit enhances your shooting experience with its sturdy forearm strap for improved stability. The innovative locking hinge mechanism ensures the brace stays securely fastened when folded eliminating unwanted movement and enhancing portability. Durable and reliable this kit is perfect for those seeking enhanced performance and convenience.