Azure,
As for the spring that Geo refer's too, take a look at this first:
http://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=439660&page=3
Ted is the resident Darne expert. Heed his caution.
Once the spring is depressed with the breech pulled completely to the rear, with one hand on the stock and the other grasping the forend and barrel, jab the muzzle into a carpeted surface. This will break the friction fit of barrel to the action. If you didn't grab the barrel and forend, the barrel could fall onto the floor by itself which is a potential screw-up. Gil