I THINK US walnut stocks were soaked in a mix of linseed oil (the real stuff, cold-pressed we would call it today, no driers, i.e., not "boiled oil") and real turpentine. Gave a durable finish, not so great for bringing out figured grain but rather good for surviving out in the elements.
The stocks had not been "whiskered" Some original condition 19th century walnut stocks have picked up enough moisture over the last century or so to raise the grain. That is the "prickly" wood, which military collectors so prize.
Given a generous imagination, one might see some "prickles" on the wrist of this 1812 Harpers Ferry musket
Or maybe no. Mat Brady I am not.