The video I remember, is I _think_ an old Vietnam era SF guy bumpfiring a beltfed Stoner with just trigger control. His accuracy and control is impressive. The rate of fire is almost indistinguishable from F/A. After watching, I tried it a few times, it's not that difficult (surprisingly).....doing it under pressure could be tricky but as far as a tool in the bag, its a good one to have.Learned how to bump fire one of my AKs from the shoulder.....so I tried it on the VZ. No luck though....trigger is just too long in terms of travel and reset. Surprised how level one can keep an AK when firing almost full auto (with a brake). Transferred my new found "skill" over to my XCRs (brought the pistol and SBR).....and found it was pretty close to as fast as the AK, minus the slightly higher muzzle flip. Probably more "usable" out of the XCR since the thing just stays flat. Crazy fun....stupid expensive.
VZ runs 100% on Wolf (provided it's "mil-spec" and made by Barnaul). Will likely leave it alone for now.
If I ever find it I'll post it up, but for now, this video demonstrates the technique nearly as well, his ROF is nothing like the Vietnam vet, but it's definitely an example of a viable technique.