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as far as i know (and that's not much by the way) a vent rib is just to raise the bead for easier sighting. maybe instead of buying a new barrel try using some aftermarket hi viz sights. but it all boils down to is, if you can shoot good with it why change it.
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I don't try to offend....some times i get lucky! 
There's always one thing that makes Republicans look good on election day...........Democrats!
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