[Rex in OTZ]

Dixie Gun Works muzzleloading, blackpowder and rare antique gun supplies. 1816 converted

Dixie Gun Works muzzleloading, blackpowder and rare antique gun supplies. Lorenz

Top DGW pic of a 1816
Bottom DGW pic of Lorenz

[rodent.22]

Isn't the lockplate on the conversions usually stamped with the contractors name and year of modification ? My buddie's is stamped h. deringer 1828 on the lockplate.

[Rex in OTZ]

Lets see if you can find that stamp? I dont think there is one the lock plate looks wrong, and the bottom sling loop is attached by a stud to the bottom the trigger plate instead of on the trigger bow, trailing edge looks pointed and the two examples I found on DGW dont quite look rite.
The top is a converted 1816
your ?? Gun
the Lorenz
US 1840
US 1822
http://en.wikipedia.org/wiki/Model_1822_Musket
Like the Model 1816, the Model 1822 was a .69 caliber smooth bore flintlock, with a 42 inch barrel and an overall length of 58 inches. One of the most noticeable differences in the Model 1822 is the attachment of the lower sling swivel. The forward part of the trigger bow was provided with an enlargement which was drilled to receive the sling swivel rivet. Previously, the sling swivel had been affixed to a stud in front of the trigger bow.
Springfield musket - Wikipedia, the free encyclopedia

[Rex in OTZ]

The swale type muzzle band showed up on the 1835 and after models 1840 & 1842 that are missing from the 1816 and 1822.
The ?? gun has that same sling loop stud of the 1816 so is it a 1816 with a later model muzzle band (1835-1842) with a .58 cal barrel (note the .69cal muzzle band?)

What you have is a 1816 stock and sling stud into the stock/triggerguard, a .69cal 1835-1842 muzzle band device and a .58cal CW era barrel.