My three 627s all came like my 625JM - with eased ejector stars. That is sufficient for rounded bullets. The two PC627s in addition have a 'trigger stop', which is nothing more than a piece of a roll pin stuck in a hole on the back of the non-MIM trigger - and that's the key here. The pictures, in S&W's '09 catalog (Still awaiting the 20102 one!) and on their site alike, of the 686SSR, SKU #178012, depict such a 'trigger stop'. Of course, the description calls both the hammer and trigger as 'forged'. Check the SKU on your box. They raised the price from MSRP $1,059 to $1,090 - they shouldn't drop features.
BTW, two years ago I was in a similar position - wanted the 686SSR. It was not what I expected, the model I fondled having a poor trigger, too. Added to the nasty-feeling grips, and I opted for the 620 - but my pusher was out. Then - love at first sight - the 627 Pro (SKU #178014 - same MSRP as the 686SSR!) - it went home with - and I've tried to wear it out ever since. Better trigger, too - and I don't care about MIM parts on it!
Maybe your pusher will let you swap - if you haven't shot the one you have. Check out the other example. Good luck!
Stainz