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jplonghunter, I have had to remove those ribs from time to time. Skeet gave you good advice. The original screws are hex type. I have been able to get most of them loose by putting the correct hex bit in the hole and then giving it a couple GOOD hits with a hammer. That seems to break the seal. Sometimes you have to put it in the drill press vise and drill off the head of the screw. Then lift off the rib and remove the screw that
is sticking out by clamping with a new vise grip (sharp, clean teeth) and turning it out counterclockwise. If that doesn't work, grind it off flush with the barrel surface and CAREFULLY drill out the stub. Be deliberate and good luck.
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