Armed Ops Tactical 45 Degree Rapid Transition System Precision Sights Back Up Iron Sights RTS for Ar15 M4 M16 BUIS Black Armed Ops Tactical Series Machined from lightweight, extremely durable 7075 aluminum, Mil-Spec hard anodized Same height above bore as standard-issue M4 / M16A4 sights MOA elevation and windage adjustments Ambidextrous sights easily and securely mount to Picatinny rails using a flathead screwdriver Low-profile sights extend only .2" above top rail, don't interfere with primary optics or military IR illuminator /laser sight