Might be transfer port but I didn't feel a hang there. Only near the end of the barrel.I'll do another pellet, push past tranfer port and then back it out to be sure.
Took the shroud part off and pushed another pellet.No clipping. So it's the end of the shroud part.Tried to take that off but no luck!So gonna drill out a .25 Shroud to work.The screwed up one from the .30? It gets sent off as a pattern for a 700mm shroud since I also have a 700mm liner!
You probably have discovered why the kit was sold in the first place.