Edgun Veles Pistol--action lock part missing

I have a Veles 22. Trying to find any pictures/measurements of the part in the action that prevents the action from blowing back when fired. It is not the balls/detents...there is another part that looks like a small block of steel with a spring that tilts into a notch when fired (saw it in one of Ed's disassembly videos). Parts are not available on the market. I purchased this gun over a year ago and never got around to shooting it. Thought it was leaking as it felt under powered. Brian at Edgun West opened it to find the part missing. The previous owner turned down the power to stop the blow back.I have the gun at Allen Z's to see if he can figure it out. Any help is appreciated. Thanks...Brewski

Mod Edit: Moved to Air Pistols forum