I have a Performance Center M&P CORE with ported barrel/slide. I wanted a non-ported barrel also. Called S&W and they refused to sell me one. However, the guy on the phone pointedly stated that Storm Lake barrels were "factory spec". Hint!

I called Storm Lake and they affirmed they made the barrel I wanted but they had a waiting list. I found the barrel in stock at Midway, bought it and it's still in my gun. The ported barrel isn't permitted in USPSA production class.

It shouldn't be hard to find Shield barrels since S&W has already made over a million Shields. Google Storm Lake, call them up and ask.

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Bob.
SWCA 1821