US 1842 musket with 0.75 barrel!

[punicwars]

I recently bought a unique looking 1842 Springfield musket with a large 0.75 round smoothbore 42 inch barrel (with no markings---it is very pitted). Overall length is 57.5 inches. The lockplate is dated 1850 at the back with 'Springfield' vertically as 'Spring' and then 'Field'. Federal eagle mostly gone. It has 'US' on top of buttplate. Puzzling since it is not .69 cal. Seems to be an assembly of US 1842 parts and brown bess barrel (with bayonet lug on bottom)! Percussion with same percussion alteration as on Confederate altered 1842 at Antique Firearms for Sale and alteration "Confederate South Carolina assembled 1842 musket' on Collectors firearms". The musket is in very bad shape and I have not jumped to the conclusion it is some kind of confederate weapon (it has US on butt and not SC for one thing). But a 0.75 barrel on a 1842 musket seems odd to me. Anyone seen anything like this? Sorry I don't have a camera to submit pictures.

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