LaserMax LMS1151G Guide Rod Laser - 5mW Green, 520nM, 20yd Day/300yd Night Range, Aluminum, for Glock 20/21/41 Gen1-3

The LaserMax LMS1151G Guide Rod Laser is a compact green laser sight built into the guide rod of full-size Glock pistols, designed for shooters who want consistent aiming reference without adding bulk to the slide or requiring a holster change. This 5mW green laser (520nM wavelength) mounts internally on Glock 20, 21, 41, and their Gen1–3 variants, giving you rapid target acquisition from 20 yards in daylight to 300 yards at night while keeping your gun's profile and ergonomics unchanged.

Installation is straightforward—if you can field-strip your Glock, you can install this guide rod laser in minutes with no gunsmithing required. The laser arrives factory-aligned at 20 yards and maintains that zero indefinitely; you'll never need to re-zero after a battery swap. Control is intuitive: an ambidextrous activation button built into the custom take-down lever gives you tactile, reliable on/off without fumbling for external switches. The pulsing beam offers high visibility in low light and works equally well indoors and outdoors, making it useful for home defense, low-light hunting, or range training.

Built from aluminum and engineered to military and Homeland Security durability standards, the LMS1151G has proven itself through drop tests, sand and salt-water exposure, temperature extremes, humidity cycles, and over 20,000 rounds of live fire. It's the kind of workhorse upgrade that stays reliable season after season without maintenance or fuss.

Key Features

• Internal guide rod design—no slide modifications or external mounting
• Green 5mW laser (520nM) with high visibility in daylight and low light
• 20-yard day and 300-yard night effective range
• Factory pre-aligned at 20 yards; never requires re-zeroing
• Ambidextrous activation via custom take-down lever
• Field-strip installation—no gunsmith needed
• Aluminum construction meets Mil-Spec and Homeland Security durability standards
• Pulsing beam for enhanced target awareness

Specifications

Laser Type	Green (520nM)
Output	5mW
Day Range	20 yards
Night Range	300 yards
Material	Aluminum
Compatibility	Glock 20, 21, 41 (Gen1–3)
Installation	No gunsmithing required
Activation	Ambidextrous take-down lever button

Frequently Asked Questions

Will the LaserMax Guide Rod Laser fit my Glock 20, 21, or 41?

Yes, the LMS1151G is designed for Glock 20, 21, 41, and their Gen1–3 versions. It mounts as the guide rod inside the frame, so no external modifications are needed.

Can I install this myself without a gunsmith?

Absolutely. If you can field-strip your Glock, you can install this laser. The process takes just minutes and requires no special tools or gunsmithing skills.

Do I need to re-zero the laser after changing the battery?

No. The LMS1151G arrives factory-aligned at 20 yards and maintains that zero permanently. Battery changes will never affect your zero.

Is this laser visible in daylight, or only at night?

The green laser is effective at 20 yards in daylight and extends to 300 yards in low-light and night conditions, making it versatile for both training environments and low-light hunting or defensive use.