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Sorry I did not anticipate this drop as I just purchased and received the M3 *no mirror or sighting mechanisms). Although I have found that sighting mechanism are not necessary for general back-country navigation, all of the other features are. The M3 weighs 50.5 grams for comparison shoppers but appears to have larger magnifying glass and no Clinometer so if you are interested in avalanche danger, the M2 just may be your compass. Just passing on some details to help out with the mass amount of choices. This drop looks like a good one for a compass.