The best just got better! From the inventors of the very first fully modular, patented, ambidextrous safety selector for the AR15/M4/M16 platform, Battle Arms Development is raising the bar on reliability and compatibility while lowering the price with the new generation BAD-ASS-PRO-FA! This professional-grade, no non-sense, duty grade semi-auto safety selector is the perfect upgrade to your AR-15/M4/M16 Machine-gun. The standard and short safety levers are fully interchangeable and modular to accommodate left or right-handed shooters. The new BAD-ASS-PRO-FA is now 100% compatible with all known(2), AR variant lower receivers, and triggers designed to work with the &ldqu Mfg: Battle Arms Development Inc.