WTB MGC68 MP40 parts

Hello guys, recently, I received an email from a pal asking if I'd be interested in buying an MGC68 MP40 and an accompanying parts gun. Need I say more? If the complete MP40 works as good as it looks, I'll be very, very happy. The parts gun was advertised as such so I can't complain.

Forum member DOC initially posted a four page MGC MGC68 MP40 instruction sheet but; the instruction material wasn't quite complete. Part #42 is a round, heavy, metal piece that sits at the rear of the lower receiver. A flat piece of thin metal (part # unknown) is shaped something like the letter "W". It has a pin or screw in the center. This piece sits inside the round cup (part#42). I believe that the "plunger system" is stabilized at one end by it's installation into the bolt and the tapered end section is seated on this missing part.

If anyone is able to follow the above perhaps, I'll find out what the part is called. If an extra whatever it is happens to be laying around anyone's house please get in touch. Will pay any reasonable price.
Many Thanks, Chris

Philb, thanks for the input, I thought that I had scoured everything relating to the MGC68 MP40. As you've indicated, there must be a great many gun variations. The C shaped clamp shown differs from the one in my complete MP40. I suspect that either one of the clamps would be interchangeable. Now to find a replacement. Thanks again, Chris