I'm in the process of ordering my SPR and scope. I had settled on the M3 found one with a good price. And now i'm thinking i might want M2 knobs. I know the M2 knobs are 1/2 MOA both windage and elevation. But i read that the M2 knobs only have one revolution turn in them, like the M3. Which would technically give them a zero stop. I've also read by other people that the M2 and M3 knobs have ball bearings in the knob functioning as a zero stop. If that is indeed true, i'll be going with the M2, but thing is i can't find a black matte M2 did they just decide they're going to do it in FDE?