I have been told by several smiths that this is an early Urbach MP5K PDW 3-lug barrel. It has a non-fluted chamber and lands & grooves rifling. I had my MP5K conversion done with a german barrel so I don't need this anymore. I do not know the total round count but the bore looks very good and shot very accurately when it was in my MP5K.
The barrel will come with the sight tower, front sight w/pin, thread protector and sling pin.