This ambidextrous safety is designed to allow the competitive shooter or hunter to disengage the safety in one easy motion while reaching for the trigger. The Safety is made from 4140 and heat treated for durability. The Safety Extension is made from 6061 aluminum and anodized in a variety of colors. Supplied are the Safety, Safety Extension, Button Head Cap Screw and Wrench. The safety will work on the following guns: Pre 2023 M2, M4, SBE, SBE II, Super 90, and Ultralight.