For shooters of microcompact pistols with under rail to mount accessories, Surefire designed a weaponlight to fit and it's the XSC... "Have No Excuses. The mean streets are no place to be making excuses about your protective equipment. If you carry one of the popular higher-capacity micro-compacts from SIG SAUER or Springfield Armory, or the GLOCK Slimline Series, we’ve engineered the SureFire XSC specifically for you. Extremely compact and virtually indestructible, it delivers intense white light, shaped by a parabolic reflector for positive target identification in the darkest confines, so you can read and react to any crisis with confidence. Its micro-footprint doesn’t hamper concealability, so you’ll have it with you when you need it most. It’s also rechargeable, with a unique lithium-polymer battery that can be swapped on the fly. Intuitive, ambidextrous switching provides instant one-finger control of momentary-on or constant-on activation to help you control the situation. The XSC’s rugged, aerospace aluminum body is Mil-Spec hard anodized for scratch and corrosion resistance, and gasket-sealed to survive in the wettest environments. If you’re serious about personal protection, there’s no excuse. The XSC is your only option.

The world’s first duty-grade, micro-compact, concealed-carry WeaponLight family
Extremely compact, virtually indestructible, 350 lumens to positively identify any threat
Specific models engineered for seamless fit on railed GLOCK 43X/48, SIG SAUER P365 and Springfield Armory Hellcat"