The GUNTEC USA Micro Breach AR-15 Pistol Brace offers greater stability, accuracy and control when firing. The micro breach brace is a pistol stabilizing brace that was designed to be low profile and easy to install for the end user. The micro breach brace is an atf approved pistol stabilizing brace that was designed to be low profile and easy to install for the end user. It is built to fit on all ar-15 pistol buffer tubes up to 1.25"