The Kriss Low Profile Flip-Up Rear Sight for AR-15 is a compact, polymer backup sight built to stay out of the way until you need it. Originally designed as the OEM rear sight for Kriss Vector firearms, this flip-up rear sight trades bulk for function—it collapses flat against your rail when folded and rises only 0.56 inches (14.22mm) above the surface, making it the kind of sight that doesn't interfere with your primary optic or field of view. It's built for shooters who want a dependable iron sight backup that doesn't complicate their setup.

The real utility comes down to flexibility. Two aperture options—a tight 1.5mm aperture for precise distance work or bright conditions, and a more forgiving 4.5mm aperture for close-quarters or low light—let you dial in for the shooting situation at hand. Both apertures tuck completely flat when you fold the sight down, so you can switch setups without worrying about the mechanism catching on anything. The large, textured windage adjustment knob is designed with gloved operation in mind, because real-world shooting doesn't always happen with bare hands.

At just 0.75 ounces, this sight adds almost nothing to your rifle's weight. The polymer construction keeps things lightweight while the base footprint of 1.19 inches wide gives you a stable platform without eating up rail real estate. Whether you're running this as a true backup to a primary optic, setting up a budget-friendly iron sight configuration, or simply want a low-profile flip-up rear sight that doesn't demand attention, the Kriss delivers the kind of practical no-nonsense design you'd expect from a purpose-built component.