If you are thinking of a red dot, the CORE, or the milled PC is the way to go. If no red dot, then I think I would do the M2.0. The new stiffer frame, seems like a good idea. I have no problems with the original, and I see no need to change, but if starting from new, I would do the M2.0, unless the optic is in play.
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Something really smart
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