I have an irrational want for that. Pistol caliber carbine with a short barrel? Makes about as much sense as a football bat.
But lawd that’s sexy.
It appears to be a USC to UMP conversion done by HDPS
Magpul MOE RVG
HDPS Rails
YHM Flash Suppressor/suppressor mount, which I believe makes that a 9mm
It is a .45 ACP. 9mm UMP mags are curved. Also, if you zoom in on the ejection port, you can see .45 ACP on the side of the bolt.
Not too many 9mm UMP conversions around. I had parts for mine, but sold them to fund a different toy. Still have .45 and .40, plus my custom 10mm conversion parts. These are great SBRs, especially with the easy caliber conversion capability. But they are spendy, as are all things HK.
Having said that, I am looking forward to this:
http://blogs.militarytimes.com/gearscout/2014/06/06/heckler-kochs-new-vp9-striker-fired-pistol/?repeat=w3tc
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“Pistol caliber carbine with a short barrel?” It’s a thing known as a “sub-machine gun”. Nifty things. Been around a long time.
This ain’t that. It’s a semi.