Hello I recently bought a new m14 and haven't had a chance to sight it in yet. My first question is regarding the numbers on the elevation nob. What is their purpose? and for each click of the windage and the elevation how many MOA at 100yds is it. Also on the elevation there is a letter M what does this mean. And finally when I do go to sight it in for the first time, should I set my windage to the center, and my elevation to its lowest setting. Thanks for in advance for helping out this m14 rookie.