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My Ultra didn't work when I got it. Got the Sig in trade for an XDS 45 that was far worse than the Sig. I think both of us left that trade laughing at each other til we used our new acquisitions. First off Sig used a full size gun rear night sight, compact needs a taller rear. That cost me $100 to replace to get POA to POI. Next the Nitron coating is thick and hides poor machining. Breech wall looked smooth but Failure to feeds were too frequent to trust the darn thing at all. I was able to smooth the gouges in the breech wall & chamber of the barrel. It is now reliable. After a year the front sight went dark, not dim... Dark. Another $45. Oh yeah, the flat wire recoil spring colapsed after 400 rounds. Flat wire springs are supposed to last a lot longer than the normal round wire. I ended up getting an EGW spring & cut 3 coils off to fit. Still using that spring with out any problems & I have 2 spares.Now it works reliably & shoots well but it still has to remind me how much it hates me by hitting me in the face with brass on occasion. I have just left the ejection alone cause we have mutual feelings... I could go on about the Mauser HSc... but I won that fight too. It works now.