I bought a PhotoSniper setup a couple years ago and have been using the included Tair 3 300mm F4.5 Preset lens almost exclusively for my wildlife photography.
Well, I just bought a Russian 500mm mirror lens from the Ukraine and thought I'd use the photosniper stock with the lens and my Sony Nex 5n camera for a compact, 750mm equivalent focal length system.
I made a pushrod setup to work with the trigger and added a metal holder for the pushrod to hold it right over the shutter button. The trigger on the stock works great! Using the stock REALLY helps steady shots using such a long lens. I can get clear, sharp images down to 1/500 sec. with this setup.
Well here are a couple of photos.