Night Sights

Night sights use sealed tritium vials that glow continuously for over a decade without batteries — the standard upgrade for any defensive pistol, since most defensive encounters happen in low light. Impact Guns carries tritium night sights from Trijicon, TruGlo, XS Sights, Meprolight, and AmeriGlo for Glock, Sig Sauer, Smith & Wesson, Springfield, and most other popular pistols.

Read our full Night Sights Buying Guide ↓

How Tritium Night Sights Work

Tritium is a hydrogen isotope that emits a faint, continuous glow as it decays — sealed in tiny vials behind sapphire lenses, it illuminates sight dots for 12–15 years with zero batteries or charging. Unlike fiber optics that need ambient light or photoluminescent paint that needs charging, tritium glows identically at 3 AM in a dark hallway. This is why tritium remains the standard for defensive handgun sights despite the rise of red dots.

Three-Dot vs. Front-Focused Configurations

Traditional three-dot night sights put a tritium vial in the front post and one in each rear notch corner — familiar and precise for deliberate shooting. Front-focused designs like the XS Big Dot and AmeriGlo CAP use an oversized high-visibility front with a subdued rear, prioritizing fast front-sight acquisition under stress. Competition-derived setups pair a fiber-optic-plus-tritium front (Trijicon HD, TruGlo TFX) with a blacked-out rear. For pure defensive use, a bright front with subdued rear is the modern consensus.

Night Sights vs. Red Dot Optics

Pistol red dots have changed the sight market, but night sights still matter — as the primary system on non-optic pistols, and as backup iron sights (BUIS) co-witnessed through an optic. Suppressor-height night sights sit tall enough to align through a red dot window, covering you if the optic fails or the battery dies. If your carry pistol wears a red dot, tritium backup sights are the recommended pairing. See our red dot sights and handgun optics pages.

Installation: DIY or Gunsmith

Pistol sights are press-fit into dovetails and require a sight pusher tool for clean installation — hammering with a punch risks marring the slide or cracking tritium vials. A universal sight pusher is a worthwhile purchase if you maintain several pistols; otherwise most gun shops install sights at modest cost. Glock front sights use a screw post and are the easiest DIY job with a $10 hex tool. Always verify zero at the range after installation.

Frequently Asked Questions

How long do tritium night sights last?
Tritium has a half-life of about 12 years — sights glow at half their original brightness at that point and remain usable for roughly 15 years total. Quality manufacturers like Trijicon warranty their vials for 12+ years. When sights dim noticeably, replacement is straightforward and most shooters upgrade the whole sight set.

Are night sights worth it on a carry gun?
Yes — low light is the most likely defensive environment, and standard sights disappear in darkness. Tritium sights require no activation, no batteries, and no thought. For a defensive pistol without a red dot, night sights are the single most valuable upgrade. With a red dot, suppressor-height tritium backups are the standard recommendation.

What night sights fit my Glock?
Nearly every sight maker produces Glock-pattern sights — Trijicon HD/HD XR, AmeriGlo, TruGlo TFX Pro, XS, Meprolight — and most fit all standard Glock models. Slimline models (43, 43X, 48) use a narrower rear dovetail and require slimline-specific sights. MOS optic-ready slides need suppressor-height sights to co-witness through a mounted dot.