Precision Machined from Aircraft Grade Aluminum with Black Anodize; Spring Loaded Posi-Lock Design with Side Plunger Release for Positive Flipping/Folding; Robust Posi-lock Plunger Coupled with Spring Activated Ball Bearing Guarantees Zero Retention; Complete with Dual Aiming Apertures Ideal for Moving Target Engagements and Limited Visibility or Normal Firing Situations; Low Profile 3mm Locking Bolt and Mounting Deck Securely Attaches to any Picatinny Rail; Designed to Match MNT-955 New Gen Super Slim Flip-Up Rear Sight on Same Level Plane Applications