Two bites on the lumps, one on the barrel extension (operating on a cammed locking mechanism a la Webley Screw Grip) and a 4th smaller extension at the top of the rear lump that is secured at the bottom of the breech face.

A couple of pics I posted above show the 4 lockup points. I hsd noticed the stop before but can't explain its utility. I have been struggling with catalogs given my weak French, so I can't report anything on that front yet.

Last edited by Doverham; 05/11/13 01:28 PM.
Such a long, long time to be gone, and a short time to be there.