Thanks for the replies,
Rich, these would be true muskets with stocks cut back to accept bayonets, large bore barrels (69 cal or greater), and very sturdy construction. I viewed originals at Valley Forge, Washington's Crossing State Park (NJ side), West Point Museum, and Fort Ticonderoga. If I recall and check my notes, all had examples of American-made muskets with maple stocks and all were very blond. There were also examples stocked in cherry and walnut. Certainly, the guns originally made as civilian arms were usually stained but it may be that the tendency was not to do that on muskets probably owing to time and cost. Perhaps another consideration might be that a musket was expected to get gouged, dented, and badly scratched up, and a stained stock wood show the damage more.
dave