Considering the huge numbers of muskets acquired for both sides, relatively few continue to exist, especially in good, original condition.
The gates and fence of Grant's Farm, in what is now St. Louis County, were made from scrapped CW gun barrels, for example.
Of those remaining, many were sold surplus and others cut down or modified into various configurations for continued use by the military.
So, if you own a CW rifle musket in good condition, you have a gem.