A white outline rear sight uses a white-painted U-shape around the rear notch opening. The R3D 2.0's orange outline is on the front sight and uses an orange-painted or colored border around the front post face. White outlines are designed to contrast with the front post to help frame the sight picture; the orange front outline is designed to make the front sight itself immediately visible against backgrounds at the draw. Orange is generally more visible than white against green, grey, or tan backgrounds common in outdoor environments, and is high-contrast against most indoor surfaces as well. The orange outline is a front-sight-only feature on this set — the rear sight is standard notch with green tritium.

The confirmed compatibility list for GL-R201P-6N covers Glock 17, 19, 22, 23, 24, 26, 27, 31, 32, 33, 34, and 35 — standard (non-MOS) variants of these models. MOS models have a milled slide with an optics mounting plate that changes the dovetail geometry and rail height. XS Sights does not list MOS variants in the confirmed compatibility for this set. If you have a MOS model or an aftermarket slide with an optics cut, contact XS Sights to confirm compatibility and whether a co-witness height is achievable with your specific optic and mounting plate configuration before ordering.

Yes. The R3D 2.0 introduces several upgrades over the original R3D platform. The most significant is the black nitride coating, which replaces standard steel with a harder, more corrosion-resistant surface treatment. The R3D 2.0 also adds black PVC rings around the tritium vials for increased contrast between the glowing insert and the surrounding steel, incorporates EasyPress installation technology for simpler press-fit fitting and adjustment, and carries an explicit 12-year tritium warranty. The original R3D used a blacked-out 2-dot rear configuration with a deliberately dimmer rear; the R3D 2.0 uses a notch rear with green tritium and no intentional rear-dimming engineering.

XS Sights backs the R3D 2.0 tritium inserts with a 12-year manufacturer warranty. Tritium is a mildly radioactive gas with a half-life of approximately 12.3 years, meaning the brightness of the glow will have decreased by half after about 12 years of normal decay. The warranty covers the full window during which the tritium will remain above half its original brightness. After that point, the inserts continue to glow but at reduced intensity. Contact XS Sights directly for warranty claim procedures and replacement options. The orange outline is a paint-based element and is not subject to tritium decay; it remains effective for the life of the sight.

EasyPress is XS Sights' installation system for the R3D 2.0 that simplifies the press-fit process. Traditional night sights seat in the slide's dovetail cut and can require a dedicated sight pusher, a bench vice, or significant force to seat fully — particularly if the slide tolerances are tight. EasyPress reduces the force and specialized tooling required for both initial installation and subsequent adjustment. The exact mechanical design is proprietary to XS Sights. In practice, this means the sights are easier to install and adjust on a bench, and that a gunsmith performing a sight swap will generally spend less time on fitting than with conventional press-fit designs.

XS Sights confirms GL-R201P-6N fits Glock 17, 19, 22, 23, 24, 26, 27, 31, 32, 33, 34, 35, and 36 — however, the confirmed list does not specify which generations (Gen 3, Gen 4, Gen 5) are included. Glock dovetail dimensions are largely consistent across Gen 3 and Gen 4 models. Gen 5 pistols share the same dovetail standard. If you have an older Gen 1 or Gen 2 pistol, or a variant model not listed above, contact XS Sights or a qualified gunsmith to confirm fitment before purchasing.