Mine broke on a Super Grade and I replaced with what I thought was the right one from Numrich's. Problem is, at the time, I didn't check mag capacity--which should be 3. I could only get 2 in. I looked at the spring and it had this "bump" (circled in photo) that prevents the follower from moving down too far.
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[Linked Image]

So, I ordered another, but different, M70 L/A follower spring from Numrich's without the bump and I can still only get 2 in. Can't figure out what the snafu is.

Murphy was a grunt.