my 4x24 m2 has a mp9 nato rectical.can anyone explain how the range finder works. it has a scale under the crosshairs with the #s 8 6 4 2 with lines at varing heights.the scope came without any instruction manual.thanks

Don't know, sounds like you need a rectical exam ....

All kidding aside. The horizontal lines below center are usually graduations indicating "holdover" for various ranges. The numbers 2, 4 etc. are likely 200, 400 meters if it's a NATO reticle. If these horizontal lines vary in horizontal length they are also range indicators in that their length corresponds to a known object size at that particular range.
--RR

I would imagine they are the height of a human torso at the prescribed range.  You bracket the torso between the lines and then dial in the range on the elevation turret.

Here is the reticle instruction sheet that came with my M2 4x24 with CQB reticle.

It is a modified MP8, so it may help:

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