Field & Rivers AR15 Rapid Transition BUIS 45 Degree Offset Front/Rear Aluminum Alloy Sights Mil-Spec hard anodized finish Ambidextrous, for right or left hand shooters Mounts directly to top picatinny rail, low profile does not interfere with primary optics Compatible with military IR Laser/Illuminators, front sight designed to clear beam path Machined from light weight aluminum alloy