Armaspec 45 Degree Short Throw Ambidextrous Safety Selector Black. With traditional safety selectors you must rotate the swtich a full 90 degrees to start firing. However with the ST45 you only have to move it 45 degrees allowing you to quickly flip between firing modes. This selector moves smoothly and has a crisp lockup making it the perfect addition to any tactical build as you can effortlessly switch between "FIRE" and "SAFE" while training and maneuvering with the weapon. This is designed for use with receivers that have the correct "FIRE" markings and it should not be used with receivers with "FIRE" markings that are 90 degrees away from each other. Specifications for Armaspec 45 Degree Short Throw Ambidextrous Safety Selector: Manufacturer: Armaspec Gun Make: AR Platform Gun Type: Rifle Gun Model: AR-10 AR-15 Hand: Ambidextrous Country of Origin: USA Features of Armaspec ST45 AR10/AR 15 45 Degree Ambidextrous Safety Selector: 45 Degree Movement Smooth Operation Ambidextrous Installation Package Contents: Armaspec 45 Degree Short Throw Ambidextrous Safety Selector What firearm models does the manufacturer say Armaspec 45 Degree Short Throw Ambidextrous Safety Selector is compatible with? The manufacturer says that Armaspec 45 Degree Short Throw Ambidextrous Safety Selector is compatible with AR-15 AR-10Armaspec ARM112-BLK: 45 Degree Short Throw Ambidextrous Safety Selector Black