H&K Enthusiasts will greatly appreciate this video about H&K's production facilities:
And those fascinated with all that goes into gun manufacturing will like it as well (even if you don't speak German, which I, happily, do--I'll translate it for the benefit of the rest of you later on).
EDIT: The video is very enjoyable, very informative, talking about everything that goes into the manufacture and testing of various H&K firearms, from the P2000, MP7, and the machine guns.
Testing includes deep-freezing, sand testing for desert conditions, immersing a weapon totally in water then firing it almost right out of the water, burying it in mud and digging it up and firing it.
Then there are individial firing tests, and factory zeroing for the rifles.
An absolutely worthy video!