The ARMASPEC ST45 Ambi Safety Select FDE enhances operational efficiency with its innovative 45-degree safety selector for AR10/AR15 platforms. This design allows an expedited disengagement from safety mode, increasing tactical response times. Engineered for seamless functionality, the ST45 boasts exceptional smoothness and a precise lockup, specifically tailored for receivers with corresponding FIRE markings. Ensure compatibility for optimal performance. Fits AR 5.56/.223 and 7.62/.308 Durable Aluminum Levers / Steel Core construction Manufactured in the U.S.A Elevate your firearm's capability with the ST45 for unmatched reliability.