I’m grateful for the discourse, guys. I haven’t been fortunate enough to handle a great deal of these period firearms first-hand, so I’m relying heavily on examples I’ve seen online. A Google search of “W. Beck rifles” and subsequent scouring of the results only turned up a single rifle that had been sold on an auction site, so it’s not as though we’ve got a lot of examples to compare this rifle to. We know that his son (W.G. Beck) was also involved in the business, but I’m not sure to what extent. Was he also a gunsmith, or was he involved in more of the administrative aspects of things? If he was a gunsmith, it’s plausible that he could’ve been tasked with restocking the rifle or even with its construction. Unfortunately, a lot of this is lost to history, and we may never know the answer.
In the 1800s, hide glue was indeed commonly used, but there were other options for water-resistant adhesives as well. Casein glue, made from milk protein, was known for its water resistance and was used during that era. As John Beck alluded to, natural resins and pitch were also utilized for their adhesive properties and water resistance.