Ksm or USC over the Omega any day of the week. I had nothing but issues after issues running the Omega with 9mm. I was told they run good in 45 but never tried it. I feel it should run all calibers as designed. Not to mention Omega’s sketchy customer service. Sent my gun to them they returned the gun with a different lower(had Tom transfer my USC trigger into a sef Lower.) they sent it back with US springs and no buffer and still didn’t run. Just with my experience alone I would skip Omega. Tom not only stands behind his product but make sure it runs before shipping it out.