Jamming MGC MP40

Hi all ! ,

Can anyone help me answer this question.? I am having an issue with 2 MGC MP40's that I have . What's happening is that the last round of any magazine fired is not properly ejecting on both guns leaving a round stuch half way out of the chamber requiring me to turn the MP40 upside down to get it out or eject the magazine .

One thing I have noticed from early on with the 2 new bolts that replaced the original ones is that a small nib that was on the face of the bolt where the round is pushed forward has broken off on both guns . Could this be the problem ?

Thanks FJ

The small nub is the feed lip and is essential for holding the round against the extractor claw , without it the rounds will drop inside the gun instead of being ejected an Im surprised any will fire/eject with this part missing.

DOC

How to repair it:
https://mp40modelguns.forumotion.net/t2403-mgc-mp40-bolt-repair-in-photos