Strike Industries Ambidextrous AR-15 Modular Selector QD Switch AR Safety Selector Black One Size. With a 60/90/60 degrees throw angle users can now quickly swap out Selector Switches based on their preference and need. With the new QD Modular Selector Switch also comes an adjustable switch angle. The selector/switch has three holes to select from each with +/- 25 degrees between each hole for micro adjustment. There are also optional switches that users can choose from including a Pedal Clutch and Arc design to pair with their new QD Modular Selector Switch to have an ambi solution. To install the QD MSS (assuming you're starting from a stripped receiver with only the trigger installed) first insert the selector barrel into the receiver. Make sure the detent and detent spring are properly installed on the bottom side of the receiver. Install your pistol grip and tighten it down onto the receiver so that it holds selector shaft in place via the detent and its spring. Now take your switch and insert the selector shaft through it. Because the selector shaft is spring load all you need to do to install a second switch on the opposite side or an endcap is to depress the center of the selector with your finger or a punch and drop the end cap/switch onto the other side. While still depressing the center of the selector on the initial side rotate the oval piece so that it's flush with the pocket and drops in. To uninstall the steps are similar. Depress the selector's shaft and rotate the oval piece that sticks out on the other side and let the retaining piece fall out. Once you let go of the side that was being pushed in you can remove the selector shaft and the switches on both sides. Note: Selector barrel features 60/90 angles. Levers allow 0 degrees +/-25 degrees micro-adjustments. Specifications for Strike Industries Ambidextrous AR-15 Modular Selector QD Switch AR Safety Selector: Manufacturer: Strike Industries Color: Black Gun Type: Rifle Gun Model: AR-15 Fabric/Material: 6061 Aluminum Alloy Hand: Ambidextrous Features of Strike Industries Ambidextrous AR-15 Modular Selector QD Switch AR Safety Selector Adjustable selector position angle Screw-free design to prevent loosening and stripping Toolless quick-detach (QD) mechanism Optional selector styles for ambi use 60/90 degree throw angles Ergonomic design for comfort Made from 6061 aluminum alloy (lightweight high strength) Package Contents: Strike Industries Ambidextrous AR-15 Modular Selector QD Switch AR Safety Selector What firearm models does the manufacturer say Strike Industries Ambidextrous AR-15 Modular Selector QD Switch AR Safety Selector is compatible with? The manufacturer suggests that Strike Industries Ambidextrous AR-15 Modular Selector QD Switch AR Safety Selector is compatible with AR-15Strike Industries SI-AR-MSS-QD-BK: Ambidextrous AR-15 Modular Selector QD Switch AR Safety Selector Black One Size