AmeriGlo
Authorized Dealer • Tritium Night Sights • The I-Dot Innovation
AmeriGlo is the US tritium night-sight manufacturer best known for the I-Dot sight picture — a deliberate departure from the traditional 3-dot pattern that dominated polymer-pistol sights for decades. Where the 3-dot rear shows the shooter two dots flanking a notch, the I-Dot shows one rear dot directly below the notch, in vertical alignment with the front-sight dot. The result is a faster, less-cluttered sight picture under stress: the eye finds two dots stacked rather than three dots spread, and the shooter aligns instinctively without the conscious dot-equalization step that 3-dot sights require. Keep Shooting stocks both the I-Dot 2 Dot Sights for Glock (universal Glock fit) and the Pro Glock 20/21/29/30/31/32/36 I-Dot Sight for the large-frame and slim-frame Glock lineup.
AmeriGlo at Keep Shooting
AmeriGlo is the US tritium night-sight manufacturer that built its position in the polymer-pistol aftermarket around a deliberate departure from the dominant 3-dot sight pattern: the I-Dot, a single-rear-dot sight picture that the shooter aligns vertically rather than horizontally. The I-Dot innovation is the brand’s defining product family, and the two SKUs Keep Shooting stocks both come from that line — the I-Dot 2 Dot Sights for Glock in the universal Glock fit (G17, G19, G26, and related compact and full-size frames sharing the standard Glock sight dovetail), and the Pro Glock 20/21/29/30/31/32/36 I-Dot Sight for the larger-frame and slim-frame Glock lineup whose dovetail dimensions differ from the G17/19/26 standard. AmeriGlo’s broader catalog covers other product lines and other firearms platforms (Sig Sauer, Smith & Wesson M&P, Springfield Armory XD), but Keep Shooting’s catalog focuses on the Glock-platform I-Dot variants as the entry point into the AmeriGlo product family.
The I-Dot Innovation — Why a Single Rear Dot Beats Three
Traditional pistol sights run a 3-dot pattern: two dots on the rear sight flanking the notch, plus one dot on the front sight. The shooter aligns the front-sight dot horizontally between the two rear dots, targeting the work that the eye must equalize three reference points along the horizontal axis. That works fine on a range bench under controlled light, but it has two known weaknesses. First, under stress, the eye tends to fixate on the front sight rather than perform three-point alignment — which means the rear-sight dots become visual clutter that the brain has to filter through. Second, in low-light conditions where tritium glow is the only visible reference, three glowing dots in a horizontal line can blur into a single bright streak rather than three discrete points, especially with slight eye motion or astigmatism.
AmeriGlo’s I-Dot approach addresses both: the rear sight shows one dot directly below the notch, and the front sight shows one dot. The alignment is vertical rather than horizontal — the shooter stacks the front dot above the rear dot, and the sight picture forms an “I” (or, with the notch above the lower dot, a figure that looks like a lowercase i with a dot above and a dot below). The visual model is dramatically simpler: two glowing points stacked vertically, with the notch reading as the alignment target. For shooters who find traditional 3-dot sights cluttered or who shoot frequently in low-light conditions, the I-Dot is the engineering answer to the actual problem of how the eye uses sights under stress.
I-Dot 2 Dot Sights for Glock — The Universal-Glock-Frame Fit
The AmeriGlo I-Dot 2 Dot Sights for Glock is the universal-fit option for the most common Glock frame lineup: G17, G19, G26, G34, G35, and the other models sharing the standard Glock sight dovetail dimensions (the dovetail is the slot machined into the slide where the sight body fits). Both the front and rear sights ship with tritium vials — small sealed glass tubes containing tritium gas that glows continuously for roughly twelve years from radioactive decay, without batteries or charging. Tritium glow is visible in full darkness with no light source, so the sight picture works whether the shooter is on a dim range, in a darkened room, or operating with a weapon-mounted light. The 2-Dot designation refers to the total dot count on the sight set — one rear, one front, vertical alignment, instead of the 3-dot pattern most factory Glock sights ship with. (Note: this SKU is OUT OF STOCK at writing; if the listing shows unavailable, AmeriGlo periodically restocks through the dealer network.)
Pro I-Dot for G20/21/29/30/31/32/36 — The Large-Frame Variant
The AmeriGlo Pro Glock 20/21/29/30/31/32/36 I-Dot Sight addresses the Glock models whose sight dovetail dimensions don’t match the standard G17/19/26 spec. That set is: G20 (10mm full-size), G21 (.45 ACP full-size), G29 (10mm subcompact), G30 (.45 ACP subcompact), G31 (.357 SIG full-size), G32 (.357 SIG compact), and G36 (.45 ACP slim single-stack). The large-bore frames (.45 ACP, 10mm, .357 SIG) run a slightly wider slide profile to accommodate the larger cartridge, and the sight dovetail scales accordingly. AmeriGlo's Pro I-Dot line is the version of the I-Dot sight engineered to those dimensions — same vertical alignment, same single-rear-dot approach, same tritium technology, sized for the Glock pistols that the universal G17/19/26 sight body doesn’t fit. Buyers ordering for a G20, G21, G29, G30, G31, G32, or G36 want this SKU, not the universal variant.
Why Tritium Night Sights Matter
Tritium night sights solve a problem that red-dot optics also solve but that fiber optic and plain-iron sights don’t: visibility in low-light conditions without an external light source. Tritium is a radioactive isotope of hydrogen with a 12.3-year half-life; sealed in a small glass vial with a phosphor coating, it produces a continuous low-level glow that the human eye reads as a discrete point of colored light (green is the most common formulation; yellow and orange are also available). The vial requires no batteries, no charging cycle, no ambient-light absorption period — it just glows, continuously, for the useful life of the sight.
Compared to alternatives: fiber-optic sights gather ambient daylight and glow proportionally to how much light is available, which means they go dark when the shooter goes inside or the sun goes down. Plain iron sights are invisible in the dark. Red-dot optics solve the low-light problem brilliantly but introduce a battery dependency, a slide modification (typically a milled optic-cut slide), and an additional point of failure. Tritium sights occupy the no-battery, no-slide-modification, no-host spot in the sight ecosystem — the baseline low-light upgrade that works regardless of whether the shooter has a weapon-mounted light, a backup optic, or any other lighting infrastructure.
Pairing & Cross-References
For the broader Glock parts catalog beyond sights — barrels, slides, internals, grips — see the parent Glock parts category. For shooters considering the alternative red-dot-optic approach to the same low-light-visibility problem, the red dot sights category covers the optic-cut pistol slide alternative. For the complete Glock brand catalog covering pistols, parts, mags, and Glock- branded apparel, see the brand landing. AmeriGlo’s broader product line at ameriglo.com also covers sight sets for Sig Sauer, Smith & Wesson M&P, and Springfield Armory XD pistols — KS catalog focuses on the Glock variants, but the manufacturer catalog covers the broader polymer-pistol market.
Frequently Asked Questions — AmeriGlo
Yes, we maintain inventory of the most popular AmeriGlo products. Each product listing shows real-time stock status. If an item is temporarily out of stock, you can sign up for back-in-stock notifications on the product page.
Yes! All orders over $49.95 qualify for free shipping, including AmeriGlo products. Orders typically ship within 1–2 business days.
Keep Shooting offers hassle-free returns on AmeriGlo products. If you're not completely satisfied, contact our customer service team for a return authorization. All products must be in original, unused condition.
Yes, Keep Shooting is an authorized AmeriGlo dealer. All products are sourced directly and include full manufacturer warranty coverage.