The Meprolight CABS (Co-Witness Adjustable Backup Sights) are a premium all-metal, Made in the USA flip-up iron sight set engineered for 100% true co-witness with 1.5" height-over-bore red dot optics, giving you instant, battery-free backup capability whenever your primary optic goes down. Featuring a green Swiss tritium-illuminated front sight and a dual-aperture rear sight with tool-free 1.25 MOA windage and elevation adjustments, these sights are always on and always ready — day or night, 24/7 for 12 years. Built to perform under pressure and backed by the MEPROGUARD Warranty, the CABS are the assurance every serious shooter needs on their rifle.