Front End and Barrel Locks (cont.):
In the upper image, the chassis front end is seen in our shop for restoration of operability of the front barrel lock.
The middle image shows the restored front barrel lock. A flip-up frame supports a moving bar at its end. This bar can be screwed up by means of a wheel (not shown) to engage slots in a bracket under the front of the barrel when the barrel is centered.
In the image below, the rear barrel lock is shown after restoration of operability. Turning the handle unscrews a pin that fits into a hole in the barrel breech.