I recently acquired a musket that has an obviously converted percussion lock marked J.TARRAT. The marking on the barrel are the letter m over 1826 and the letters I or P over IP. The overall length is approxiamately 4'11".The hardware is brass and has a steel rod.Also, it once had sling swivels. It also was built to mount a bayonet. Sorry I'm not able to post pictures as of yet. Any information or ideas would be greatly appreciated. Thanks!!