To prove your point Mike: see HERE (video of LG380 firing)
Agree with dvd, only the opposing piston match guns are truly recoilless and flat to shoot. Not only was it genius to invent this system but, at least with the Dianas, they managed to make the production cost low too. It's often said that Diana lost the marketing battle against FWB and also delays with getting the sidelever 75 to market cost them dear.