It is well known that the different parts of firearms were made by different specialized smiths, in their own shops and then sent to assembly.
Before mechanization systems were implemented, manual output had (slight) measurement variations, the various parts of an assembly having to be "fine tuned", i.e., adjusted to accomodate their specific partner. It is expectable that the stock, being the softer part, had to be adjusted to its barrel ... and lock. This system is evidentiated by the cuts we can see in this stock mortise; it would be no surprise to find the same number of cuts underneath its chosen barrel*, if still being the case ... as also inside the lock plate.
I do not see why Mr. Herbert was not the head of the Liegeoise workshop where this stock came from
*As per illustrated example.
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