AR-15 A2 Front Sight Tool FST-A AR15 Precise incremental adjustment of A2 Front Sight Post Dual sided tool fully indexes to the front sight post (similar to a socket) Provides an audible click and tactile feedback to the user with each rotation Single prong design fits the four slotted A2 square front sight post Manufactured from a heterogeneous hybrid of 420 Stainless Steel and Brass