new guy,
Thanks for the photo.
Yeah, I'm quite familiar with the Anson fore-end design.

The photo shows the release rod, ( or the tube it is housed in) but in my experience that rod is usually NOT threaded.
There is a rod which is fitted inside a tube with a return spring.
The rod is fitted into a hole in the front of the locking bolt and is held in place by that tiny grub screw that can be seen in the photo.
If you undo that screw a few turns or wind it out fully, this will allow the release rod and spring to be withdrawn.

So I feel the photo shows a release rod, but not a "threaded" rod or "stem".