Sig's SBX Pistol Stabilizing Brace, is an update to the SB15 Pistol Stabilizing brace. It is a shooter's aid that is designed to improve the single-handed shooting performance of buffer tube equipped pistols. The SBX features a more slim design with a thicker strap for extra stability. This veteran-designed and U.S.-manufactured accessory enhances accuracy and reduces felt recoil when using an AR-style pistol. Made from high-quality, elasto-polymer, the SB15 is manufactured to close tolerances and fits all pistols equipped with an AR-style buffer tube 1.0" 1.2" in diameter.