With a crazy-fast reset nearly nonexistent over-travel and a smoother crisper lighter trigger pull the RISE Armament RA 535 Advanced Performance Trigger (APT) helps you fire more quickly and accurately. Its highly regarded as the best of triggers. Now available with a black trigger blade the RA-535 APT will not only improve the performance of rifles but the look of it as well. The single-stage trigger group is easy to install. It also includes free anti-rotation pins.