
Why didn't more 18th-19th century muskets have rear sights?
I was watching the Keeper of Firearms analyzing an Italian arquebus used in the 16th century and was jump-scared when he showed the rear sight of the arquebus that allowed for precision shooting. I did a shallow dive and it seems even heavy matchlock muskets had bit of a v-shaped rear sight for accuracy. The only musket from the 18th-19th century that I could seem to find that has a rear sight is the Prussian M1809 Potsdam Musket model that has a v-shaped rear sight.
It seems bizarre that only early and rifled muskets had rear sights, but rear sights just don't seem to be a thing for the more well known muskets such as Brown Bess and Charleville usually only having the front bayonet lug as a sight. I've read that when the 'Present' order is given soldiers are supposed to aim their weapons to fire. Why did rear sights seemingly fall from relevance until rifles muskets showed up? Wouldn't that increase the accuracy for soldiers or is the musket really that inaccurate?