The XS Sights R3d 2.0 night sights for Glock 21 bring reliability and visibility to your carry gun without the installation headache. This second-generation system pairs a serrated, blacked-out rear sight with a dual-illuminated front sight that glows day and night—orange photoluminescent and tritium-powered for situations where ambient light fades. Whether you're training at the range, carrying for duty, or running low-light scenarios, these sights keep you focused downrange with high-contrast aiming points that work equally well in sunlight and darkness.

Installation matters on carry guns, and XS engineered these sights to demand 50% less force than the original R3D—meaning a bench vise and punch, but not the white-knuckle frustration. The black nitride finish and robust construction are built to survive years of daily carry, draws from a holster, and the occasional fumble. The rear sight ledge is a practical addition for one-handed slide manipulations if your other hand is occupied or compromised.

If you shoot your Glock 21 seriously—whether for self-defense, competition, or duty—night sights are one of the smartest upgrades you can make. Your eyes will find that bright, visible front dot in dim light faster than any standard sight picture, and the blacked-out rear keeps distractions away and drives focus to your target. Tritium and photoluminescent technology means these sights work without batteries, in any weather, and won't fade when you need them most.