Battle Arms Development Bad-Ass-Pro AR-15 8620 Steel Ambidextrous 90/60 degree Black Phosphate 862. It comes standard with a reversible throw safety center with 0-90 and 0-60 short-throw options. The standard and short safety levers are fully interchangeable and modular to accommodate left or right-handed shooters. The new BAD-ASS-PRO is now 100percent compatible with all known AR variant lower receivers and triggers designed to work with the "Mil-Spec" AR-15 semi-auto safeties. No longer do you need a short-throw relief cut on your lower receiver to use the ambidextrous safety simply use the provided short-throw markings sticker No longer do you have to choose which trigger is compatible with the safety If the trigger it will work with is a Mil-Spec AR-15 semi-auto safety it will work with the new BAD-ASS-PRO Specifications for Battle Arms Development BAD-ASS-PRO Bad-Ass-Pro AR-15 Black Black Phosphate 862: Manufacturer: Battle Arms Development Color: Black Finish: Phosphate Gun Model: AR-15 Fabric/Material: 8620 Alloy Steel Hand: Ambidextrous Condition: New Battle Arms Development BAD-ASS-PRO Bad-Ass-Pro AR-15 Black Black Phosphate 862 What firearm models does the manufacturer say Battle Arms Development BAD-ASS-PRO Bad-Ass-Pro AR-15 Black Black Phosphate 862 is compatible with? The manufacturer suggests that Battle Arms Development BAD-ASS-PRO Bad-Ass-Pro AR-15 Black Black Phosphate 862 is compatible with AR-15