LaserMax LMS-1151G Green Guide Rod Laser for Glock 20/20SF/21/21SF Gen 1-3 - Black

The LaserMax LMS-1151G is a high-intensity green guide rod laser sight engineered specifically for the Glock 20, 20SF, 21, and 21SF pistols in Gen 1-3 configurations. The unit replaces the factory recoil spring guide assembly, dropping in as a fully internal aiming system that leaves the grip profile, holster fit, and factory iron sight picture completely untouched.

The laser emits at a 520nM wavelength with 5mW of output, producing a vivid green beam that is significantly easier to pick up in daylight and well-lit indoor environments compared to traditional red lasers. The aiming dot measures roughly 0.63 in at 20 yds, with a useful range out to 50 meters. A user-programmable pulse or steady beam mode lets the shooter tune the visible signature to the conditions, and the distinct ambidextrous ON/OFF switch built into the guide rod itself is accessible from either side of the frame for right- or left-handed operation.

Installation is straightforward: the LMS-1151G drops in place of the factory guide rod and uses the pistol's existing recoil spring. The unit is powered by a single 393 battery housed inside the guide rod. The housing carries a durable black finish that blends with the factory slide, and at just 0.76 oz the unit adds essentially no weight to the firearm. Because the laser is factory-aligned, no user adjustments are required after installation, making it a true drop-in sighting upgrade for full-size Glock duty and defensive pistols.