Aero Precision PRO M4E1 Ambidextrous Safety Selector - Anodized Black - Introducing the PRO Ambidextrous Safety Selector. Forged with Premium Materials and Engineered for a Safe, Reliable, and Precise Shooting experience. This drop-in part is configurable with a reversible selector drum, allowing for either a 45 or 90-degree throw out of the box. Each lever is retained by captured detents, which eliminate the possibility of loosening lever fasteners even during the most demanding firing schedules. Two different lever lengths allow shooters to maintain the benefits of an ambidextrous selector without creating interference for their dominant firing hand during manipulation. Compatible with most AR15 and AR10 platform rifles. Includes: Safety Drum- Black Nitride Finish Safety Lever - Anodized Black Finish