Shaggy, if you like it, enjoy. I look at what role the gun would fulfill - and I have no objection to ""toys"".
Yes, it has the barrel legnth of a pistol - but not the concealability.
It may indeed be controllable, but with the short barrel and sight radius, it will be lacking in accuracy (unless, of course, you choose to bolt an optic sight on it, making it even more bulky).
And I am not lacking in experience with "machine pistols", including the full auto Glock, Baretta, Skorpian, Trejo, H&K PDW/MP5k, and others.
Go have fun with it!