TRUGLO Glock 42 Night Sights – Durable Night Sights for Glock 42 with Focus Lock

Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, daily CCW practitioner.

Glock 42 night sights from TRUGLO use tritium gas-filled vials to provide self-luminous aiming points 24/7 — no batteries, no charging under a lamp, no switches. The rear sight features two green tritium inserts flanking a blacked-out notch; the front carries a single green vial encased in a white target ring for daylight contrast. Focus Lock technology refers to the high-visibility alignment geometry: when the front dot centers between the rear dots and all three sit level, your sight picture locks to point of aim. You draw, find the tritium glow, align, press. In total darkness or under a streetlight, the process stays identical.

Behind the Glass

TRUGLO manufactures these sights from steel, then anchors Swiss-made tritium vials into machined recesses and seals them with epoxy. Tritium is a beta-emitting isotope with a half-life of 12.3 years; expect full brightness for the first decade, then gradual fade. The rear sight body measures wider than factory plastic to increase the aiming surface, and both front and rear edges carry dehorning to prevent snagging on clothing during the draw stroke. The front blade uses a white paint ring around the tritium dot for high-contrast acquisition in daylight; at night, only the green glow is visible. The set ships with a hex key and drift punch installation instructions, though most shooters prefer a sight pusher tool or professional installation to avoid marring the slide.

Specs at a Glance

The Glock 42 is the single-stack .380 ACP subcompact in Glock’s lineup, and aftermarket sight options remain more limited than for the 9 mm models. This TRUGLO set is among the few tritium solutions purpose-cut for the 42’s dovetail dimensions. Browse additional gun sights for other Glock models and sight technologies in our catalog.

Where It Shines

Concealed carriers who practice low-light dry fire and live fire will see the most benefit. The tritium glow helps you confirm sight alignment during the draw without hunting for painted dots or relying on ambient light. Range officers and defensive instructors also appreciate the consistent point-of-aim reference during malfunction drills and one-handed shooting strings, where visual confirmation must happen in a fraction of a second. If you carry the Glock 42 as a backup gun or primary EDC, self-luminous sights eliminate one variable: you know your sights are visible the moment you present the pistol.

Care & Maintenance

Tritium requires no maintenance beyond periodic inspection of the vial seals. Wipe the sights with a silicon cloth after range sessions to remove carbon and residue; avoid solvents on the tritium inserts themselves, as some chemicals can cloud the epoxy seal. Check tightness every 500 rounds — if the rear sight shifts under recoil, re-drift and apply a drop of blue threadlocker to the dovetail. After 10-12 years, brightness will drop below useful levels in total darkness; replacement sights will restore full luminosity. Store the pistol in a manner that prevents impact to the front sight — dropping the muzzle onto concrete can crack the tritium vial or dislodge the insert.