I'd just replace the bolt and barrel. A more difficult fix which requires some machinery is to drill the gas port out and install a 4-40 set screw drill through it using a 1/16" drill bit (this will be .0625"). If the port is that eroded the barrels throat may be eroded too making for bad accuracy.
Randall explained the fix here in this thread.
I have access to a few milling machines and lathes and I doubt I would even try this unless I owned the barrel.
Chief Armorer for Elite Shooting Sports in Manassas VA
Chief Armorer for Corp Arms (FFL 07-08/SOT 02)
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