This UTG low profile flip-up front and rear sight kit with dual aiming aperture is compatible with AR-15/LR-308 platform rifles and pistols equipped with a flat top Picatinny rail. The high-quality UTG low profile flip-up front and rear iron sight sets are made from aircraft-grade aluminum with black hard anodizing and steel components to enhance its durability for rugged tactical and combat use. This AR low profile sight set is one of the best made and features the UTG super slim low-profile flip-up sight design we all want. The best part is that they are very easy to install and unlock, and you can fold them both down when they are not in use. The front sight post is elevation adjustable with any standard 4-prong AR front sight tool. The rear sight features dual aiming apertures, making it ideal for moving target engagements. This sight set has a robust posi-lock plunger coupled with a steel spring-activated ball bearing and locking bolt, which guarantees zero retention and can handle heavy recoil all day long backed by a UTG Limited Lifetime Warranty.