Heresy Design Enhanced Magazine Release For Steyr AUG - NATO Black. This is a standalone replacement for the factory magazine release and improves fit and function of magazines. Specifications for Heresy Design Enhanced Magazine Release For Steyr AUG - NATO: Manufacturer: Heresy Design Gun Make: Steyr Gun Model: Steyr AUG Color: Black Features of Heresy Design Enhanced Magazine Release For Steyr AUG - NATO Easy to install with slave pin included Eliminates magazine tilt for consistent feeding Tested with various AR-15 compatible magazines Billet machined from 6061-T6 aluminum 17-4 roller bearing MilSpec hard anodizing Limited Lifetime Warranty Package Contents: Heresy Design Enhanced Magazine Release For Steyr AUG - NATO Slave Pin Sticker What firearm models does the manufacturer say Heresy Design Enhanced Magazine Release For Steyr AUG - NATO is compatible with? The manufacturer suggests that Heresy Design Enhanced Magazine Release For Steyr AUG - NATO is compatible with Steyr AUGHeresy Design HD-EML: Enhanced Magazine Release For Steyr AUG - NATO Black