I just got my SA139-O in the mail, they are Shield specific. I am noticing the tritium vile in the front sight is high, there is more orange in the bottom than the top. If anyone is looking I purchased mine off Amazon. I think they had 4 left in stock.

I have a set of these on my M&P, it was a great choice in my opinion, the sight picture was less distracting because all focus is directed towards he front sight if makes sense.

Which brand are you referring to when you say "SA139-0"?
Ameriglo? Trijicon?

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40c FS,9Shield(2)40,9Pro

I went with the Tru Glo TFO's. With the Tritium, you ddon't have to worry about hitting your night sights with a flashlight. Pull your pistol out of darkness and the sights are Always glowing!