Thanks for all the suggestions. I couldn't decide between the Dara or JM Custom OWB2 so ordered both, and may sell one later.

I spent some time checking all the recommended holster manufacturers from a curated CCW OWB list (which included JM Custom). Since I specifically want an M&P 9 M2.0 4.25" (full size) OWB left-hand full Kydex (not half shell Kydex) holster with slide shield and red dot cut the resulting holster list was very short. As of October 2017 I found three companies listing holsters on their website meeting these criteria:

• Dara Holsters - Custom Kydex RMR Cut OWB Holster
  • I ordered 1.5" single loop, 15 degree (FBI) cant, high ride
• JM Custom Kydex - OWB1 and OWB2
  • I ordered OWB2 1.5" belt loops, 10 degree cant, high ride
• Comp-Tac - Flatline Holster (M2.0 compatibility not specifically listed)
  • Customer support says 9mm/.40 is compatible with M2.0
  • Customer support says .45 is not compatible with M2.0

Two other holsters I found:

• Huckleberry Tactical - Traditional Concealment OWB
• Dale Fricke Holsters - Michael Red Dot Sight OWB (does not specifically list M2.0 compatibility)