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Any idea what the circled "P" on the side of the barrel lug represents?
I always thought it meant "proofed". That's definitely a German barrel--you can tell by the blue finish. US made barrels have a parkerized finish. I always thought the circle-P was the proof mark for barrels that would NOT be a part of triple-serial German proof marked guns. The barrels still have to be tested no matter where they are assembled or sold.
 

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Most modern SIG barrels are stainless steel (ferritic and so are magnetic nonetheless). Stainless doesn't get blued. If that's stainless, as would be ThnkFrst's 2007 vintage barrel, then it's probably Nitron coated. In order to be blued, it would have to be an earlier carbon steel barrel.
 
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