Gunnutery - Actually, the Mp5 is a machine gun, not an SBR.
I don't want to give this away yet (though they're all identified on the blog post, if you follow the picture link) - I'll just say that this particular selection was chosen specifically, and there is some historical significance to each one.
So the challenge stands - who can identify them?
BTW, they are in an unfinished workshop, not basement - it's the best photo background we had available.