Often European gunmakers leave the regulating wedge protuding, even after finishing a double rifle.
Some Italian double rifles left the factories with unblued barrels "in the white". If the European gunsmith who retails the rifle has to mount a scope on request of his customer, using soldered claw mounts, he very likely has to reregulate the rifle for scope use anyhow. Or if, for instance, the rifle was regulated at the factory for the 9.3x74R classic 18.5g = 286gr bullet load, but the customer wants to use either the 19g = 293gr TUG or the 15g = 232gr Norma Vulkan factory loads, again slight reregulation may be required. Of course, you may also regulate a dr by adjusting handloads, but most European dr users are not handloaders and insist on shooting a certain factory load. And it is a known fact that otherwise perfect dr barrels may lose regulation after many years: Tensions built in originally may "set" over the years and change barrel vibrations and thus regulation. Reregulating is vastly simplified if on resoldering the muzzles the regulating wedge may be gripped and moved. If the wedge was filed flush after the first regulation, you have to remove and it entirely and make and fit a new wedge. So on all the double rifles and dr-drillings I had to reregulate I leave the wedge protuding. As a side effect, a protuding wedge also offers some protection to the muzzles.