Hi,
What is the length of the barrel? I need to see the trigger guard and forward 2 ramrod pipes. Because bayonets were hand fitted to each musket, they usually had matching unit and gun markings. The "LI" may indicate light infantry. There are two possibilities suggested by the markings. There was a short lived 100th regiment of foot raised as a light infantry regiment in 1780, fought in India, and was disbanded in 1785. Then there was another 100th raised in Ireland in 1804 and sent to Canada where it fought in several battles along the St Lawrence River during the War of 1812. I believe a proper dating of the musket will identify one or the other, which is why I need photos of the barrel length, trigger guard, and ramrod pipes.
dave