Was very funny to build and play with it. I knew it in Battlefield 2 Modern Combat game.
About this creation
It's a German submachine gun. It's in real size, but when you look to it, looks small. When I finished and took it, I think the same, that it was small. But it's a SUBmachine gun. It's supposed to be small.
It's made by Heckler und Koch (HK)-(und = and in german), a German weapons factory, the same that made the MP-5 and the G36 assault rifle. "UMP" means "universal machinen pistole", somethimg like "universal submachine gun". That's what is right in world.guns.ru (not www.world...), but I think that sounds more like "universal automatic pistol" for two reasons: because there are other weapons with "MP" - in this case, UMP -, like MP-5, MP-44(WWII), MP-40(WWII too), MP-7 and others. And least MP-44 wasn't a submachine gun and the german and the english have came from the same language (I don't know what language is), so maybe Pistole = pistol and machinen = automatic (like MACHINE gun, understood?).
Ahh, and for who asked: yes, I played BF2: Modern Combat for PS2, and sorry for no images; I'm having trouble to put one. But I have allready built an AK47, XM8, somekind of assault carbine based in a weapon of BF2142, and other ones.
I'm sorry. But, I'm working to put some photos of them faster than I can.

Enlarge image
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I TRIED to take a photo of the iron sights, as u can see
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