Fits Sig Sauer models calibrated for .40 S&W and .45 ACP including P220, P229, P240, P245, P938, Pro 233, Pro 2340, and Pro 245; Increased height to accommodate multiple shooting applications; Instantly visible sight picture in no-light and low-light situations; Increased daylight dot visibility; Enhanced protection from heavy recoil and harsh cleaning solvents; Evenly distributed light from tritium lamps