I think Robar is coating the M4s, and they enjoy a very good reputation. They coat pistols for Wilson, also. If your talking about the cerakote type finish Wilson uses, that's completely different than NP3 or Nickel boron, which have a molecular bond to the base metal. Like other in demand shops, Robar always has a backlog. I'd guess they are the limiting production factor on the H2Os. I'm not concerned at all about the finish if it's coming from Robar. BTW, Wilson guarantees their finishes, even for wear. You can have your Wilson dealer send it in, and it will come back like a new gun.