The LaserMax LMS1151G Green Guide Rod Laser from Lasermax is a precision illumination solution designed for Glock 20/20SF/21/21SF Gen 1-3 in a sleek black finish, offering a compact, integration-ready enhancement for fast target acquisition. This 520 nm green laser is compactly embedded into a guide rod assembly with a 393 battery, delivering a 5 mW output that delivers a bright, adjustable dot measuring approximately 0.63 inches at 20 yards and an effective practical range up to 50 meters. The system is engineered for straightforward installation without additional mounting hardware, aligning with Glock handguns through a dedicated guide rod setup that preserves the firearms balance and handling. Weighing only about 0.76 ounces, the LMS1151G adds minimal weight and maintains a clean profile, while the power switch is designed for reliable operation without complicating the holstering or shooting process. Ideal for both duty-style training and practical field use, this Green Guide Rod Laser from Lasermax enhances sighting speed and accuracy in low-light environments, turning rapid, precise aiming into a natural part of your shooting routine without altering the firearms manual safety or ergonomics.