I've got two Operators (PX9105L and PX9105ML) that I've had for months and never shot because I couldn't come up with a holster. Be advised that Blackhawks (made in Vietnam) generic 1911 holster will definitely pop the thumb safety into the fire position when you engage the retention strap thumb snap. Eagle knows this too, and had no remedy when last I heard from them.
I finally got two (at once) that work.
For all you Kydex fans, Blade-Tech's work.
For all you leather fans, High Noon's work. If you buy them lined, they're a tad pricy, and a two week wait (anyway). But in my opinion they are excellent holsters (and I've carried a few). They snug the weapon tightly against your body (Blade Tech's don't), are comfortable to carry and make the weapon about as concealable as you can get a gun that big to be.