Our good friend Trev Weston sent us this photo. I love the expression of the guy holding the tripod steady!
The machine gun looks to be, at least to my untrained eye, a MG34. It has anti-aircraft “spider web” sights mounted at the front with rear anti-aircraft sights mounted in front of the feeding mechanism. The tripod was designed specifically for anti-air use. It would normally have sandbags weighing it down, or the gunners assistant would be sitting underneath it and using a strap (visible in the photo) to hold it down with his weight … not clambering all over it like a fool!
This US Army training videos shows how it was supposed to be used …
Hat Tip War History Online.