I'll give you my quick answer.
EMF, like all the importers (Cimarron, Navy Arms, etc) sells mostly Uberti guns. Uberti is out of Italy. Italians are not the same in business relations as we have come to expect. I have a few friends on the inside.. you get what you get when they send it. And because we are buying everything they make, there is little incentive to improve their delivery practice.
That is why you will find runs of different guns suddenly available in huge numbers, never to be seen again. Like the whole shipload of opentops but only in 44 colt.
That's the way of it. Adios,