The Crimson Trace DS-121 Defender Series Accu-Guard Laser Sight is designed for GLOCK full-size and compact pistols. Featuring Beam Lock Adjustments for windage and elevation, this laser sight is pre-sighted at the factory at 50 feet. The Dual Side N-Gage Activation Buttons provide a large, easy-to-find activation button, emitting a powerful 5mW red aiming laser. With its cutting-edge design and affordable price, the DS-121 sets a new standard in laser sighting systems, ensuring enhanced accuracy and confidence for GLOCK owners. Crimson Trace DS-121 Defender Series Accu-Guard Glock Full-Size & Compact Red Laser Sight 01-5100-1