The best just got better! From the inventors of the very first fully modular, patented, ambidextrous safety selector for the AR-15 platform, Battle Arms Development is raising the bar on reliability and compatibility while lowering the price with the new generation BAD-ASS-PRO! This professional-grade, no non-sense, duty grade semi-auto safety selector is the perfect upgrade to your Smith & Wesson M&P15-22. It comes standard with a reversible throw safety center with 0 degree-90 degree and 0 degree-60 degree short-throw options. The standard and short safety levers are fully interchangeable and modular to accommodate left or right-handed shooters. No more broken screws! Don't settle for wiggling levers! No more stripped screw heads! The new patent-pending dovetail design and internal locking mechanism make it impossible to shear off the screw head because there is no screw head! Do not settle for spring-loaded detents that never give your safety lever that positive lock of confidence and worry about losing the small parts. The new BAD-ASS-PRO locking mechanism is robust, reliable and something you can depend your life on! The new 5/64, set screw is also designed to resist stripping.