NBS Rapid Transition 45 Degree Offset Backup Iron SightsRugged and DurableCNC Machined using 7075 aircraft grade aluminum and then hard anodized.StandardizedThese sights are the same height above the bore as standard-issue M4 / M16A4 sights and feature 1/2 MOA windage and elevation adjustments.Ideal Companion for Large Primary Optics45 degree offset sights are a popular choice for shooters from operators to competitors. These backup sights provide the shooter the ability to rapidly transition from close to long range targets making your AR-15 effective in a variety of situations.Backed by the NBS Limited Lifetime Guarantee