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5,750 Posts
Either way is fine for the wave spring.

Now for the markings...

M designates meters

11 is 1100 meters

2-8 is 200-800 meters

Should be "SA" for Springfield Armory (commercial units are marked "SA")

10 is 1000 meters

There should be a horizontal line below the "2", this is the 100 meter mark.
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