It would seem reasonably to assume that LAC placed the Belgian proof conspicuously on the barrels as evidence of quality, rather than an indicator of the absence thereof.

Nov. 30, 1895 Sporting Life
"How Shot Guns Are Made and the Process Through Which They Pass Fully Explained"
The beginning of the manufacture of a gun is the barrels, and it is generally known that no barrels are made in this country except the rolled (decarbonized) steel, which is used on the Winchester gun. All gun barrels are now imported, although an attempt was made a few years ago to produce them in this country, but with only partial success. England, Germany and Belgium supply most of the barrels, the latter country doubtless producing the larger quantity.
All gun barrels, whether imported direct from the makers in Belgium, or through an importer in this country to the gun manufacturer, are received in rough tubes, which very much resemble a couple of gas pipes, but being somewhat larger at one end than at the other. These barrels or “tubes” as they are called, are merely tied together in pairs, with small wire and 40 to 50 pairs are packed in a box.

Lefever with Crown over 'GL', likely George Laloux, but Gaspar Lejeune of Foręt was a member of the Syndicat des Fabricants de Canons de Fusil de la Vesdre The stamp is somewhat indistinct related to the pre-joining finishing



Fluid steel Lefever with the mark of Charles Clement & Neumann Freres: two crossed hammers with the inscription "Hammered Fluid Steel" and the letters "CJCJ" in the angles of the hammers.