As Nate said, it is a M1816 musket. The front band is probably from either a US M1840 or M1842 musket. Is the sight blade brass or iron? If the sight blade is iron, someone has used a reproduction of the '42 front band.
The ramrod is a reproduction US M1855 rifle musket ramrod.
And, I hate to say it but the lock appears to have replacement cock, frizzen, pan and frizzen spring. They are decent quality parts but reproductions none the less. Also, the frizzen screw, hammer screw and the frizzen spring screws are only vaguely similar to originals.
Also, is the barrel 42 inches long? I am not seeing a bayonet lug on the barrel.