They are most definitely NOT unicorns. I handled a couple that were in the Granger shop when I was last in St. Etienne, and they are quite simply the equal or superior to anything produced anywhere in the world.
Europeans have different taste in stocking and engraving (think swept cheek pieces, and big game engraved on bird guns) but, Richard Levi, who owns G. Granger, can build you one to any specification you desire. Bring money.
The sidelock release is activated when the gun is broken down, by pushing the trigger for that lock forward, with the sidelock politely raising itself out of the wood for inspection or cleaning. Never have seen anything to equal it.
Best,
Ted