ZEV Technologies Combat Night Sights give shooters a durable high visibility iron sight option that works in all lighting conditions. Designed to be identical in form and function to the ZEV fiber optic combat sight set but with the addition of tritium vials for low light illumination. The front sight has a narrow bright orange ring surrounding the tritium dot for daytime use. The rear sight has an angled edge to aid in one handed operation of the slide, and does not overhang the RMR optic cut. Due to the low mounting of an RMR with ZEV's patented optic cut, it still provides a lower 1/3 co-witness with an RMR mounted. Assembled in the USA with Swiss tritium for maximum brightness. DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.