I came across this Capping Breech Loader at the Bisley Arms Fair on 29th March. It has no name and its appearance suggests that it was possibly made in Belgium with an eye to the British Breech Loading Trials in 1864 as it has British style sights and fore-end coupled with a very Franco-Belgian lock area.
 
The mechanism involves a small lever, which being raised, cams back a moveable breech plug not unlike that in the Monkey Tail.  This releases the main hinged block which then swings over to expose the breech.  The usual arrangement of hammer safety locking is involved.  The wad based cartridge after insertion is fully pushed home by the final movement of the locking lever.
 
Anyone familiar with this design ?
 

 

 

 

It was months ago and I cannot really remember what the bore was but I think it was about .577.  I was only interested in the breech mechanism.  Jim Hallam says that it reminds him of a certain make of CF cartridge BL but you will have to ask him.