I have my camera mounted to their picatany rail mount. if you have a pic rail I suggest getting it. That mount is awesome. I don't know if you know this but you can invert the camera on the 4.0 to mount under the barrel but still have it shoot right side up. I'll post pics of that mount tomorrow. I tried the head mount for the first couple birds, but the bird always seemed to be just out of sight of the camera.
I don't always keep my composure but I've been trying to get better at it. Still shake like a leaf after the shot for about 5 minutes lol.