SigSauer also makes threaded barrels and the finish will match your 220. Here is a link for you. They are also less expensive.
I have a Bar-Sto barrel for my P220 and it's nice. The Sig barrel wasn't available when I bought mine. The Bar-Sto has a silver finish if that matters to you.
Bar-Sto comes with the thread protector. Not sure by the listing on the Sig site if theirs comes with one or not. If not, that brings the cost a little closer.