Well yes there have been changes. The older 9mm Tactical did not come with the match trigger. The newer ones do come with it. I don't remember what year they made the change, but the 2014 would not have come from the factory with a match trigger.
In late 2014 early 2015 HK introduced the USP9 Tactical. The threaded barrel 9mm USP before then is the USP9SD.
The Tactical has Tactical on the slide, an O-ring barrel, & semi match trigger components. You will have to change a few springs out & the hammer to make it a true match trigger system. Still an excellent trigger though.
The SD just has USP on the slide. None O-ring barrel, & standard trigger components. It’s basically a standard USP with a threaded barrel. Still an awesome pistol.
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