it seems that the new one more time was spent on making sure that it worked right out of the box where as the first few batches they were more of a rush to get them out because they were months behind their release date. the smaller trigger gaurd models can, have, and will work fine. you just may need to pay alittle more attention to it at first
If you get your omen from Shadrach or any store now it should be Biggerframe and Black trigger. Evil says nothing is different other than that but it has been apparent that more quality control was brought along with them. Omens are fairly new guns so the first few batches were to get the kinks out. And it seems the kinks are almost gone.