【Perfect Compatibility】: Our picatinny rails with standrant specification allowing you add on any standard 21mm Picatinny accessories. Such as flashlights, iron sight, red green dot sights,or other more tactical accessories. 【Simple to Install & Superior Support】: Install screws by allen wrench tool, easy to install or remove. Perfect Lock System and once tightened they have not shaken loose . Superior Support makes it a great addition to help upgrade your style!