F*ck me...that shouldn't be in a V2, nor a V3 mechbox...
I'm mentally going over an MP5...can't pick it out.
I do suggest you take a look at each of the posts that join the two plastic halves of the upper receiver together...there's several posts that mate up with holes/posts. I think (I really can't remember and I'm not going to the workbench to disassemble an MP5 to check) that some posts have rods like that. It might have pull off a post when you took the MP5 apart.
Tys
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