Somewhere in my mess, I have an old reprint of a book from the 1700s that showed not only carpentry techniques, but also some tools. There are several pictures of vises of all wood construction. In an 18th century gun shoppe, these would have been totally appropriate, and I would wager, common. I have a very old blacksmiths post vise myself, but would never use it for holding a stock. Only for holding metal parts. Though it is broken in several spots, it has served me well and I will continue to use it.
But consider a wooden vise while I try and locate my book... I know wooden vises were common in that era, since many iron vises had to be imported, and were thus expensive.
Matt