To add a little to my friend Zippy's comments - I wouldn't own a gun without a mid rib bead.
For some reason, I have a tendancy to cant a gun or roll the gun a little to the left once in a while when I mount it - and by lining up the beads I can see right away, I need to drop the gun from my shoulder and re-mount the gun. A mid rib bead is really important to me - to keep me from doing that...
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