I'm thinking of purchasing a USO SN-3 3.2-17x44 in the near future (I'm waiting to decide until I get back from Iraq). I would want to get the US #3 M40 style knob with windage stop. I like the stop because I'm used to the S&B we use on our M40A3's, Mk11's, and SASR's, which offers 6 mils left...