Muzzle-Loaded Long Gun
Puzzle 1 of Famous Buildings Medium Pack
Question is: Muzzle-Loaded Long Gun
and the answer is: MUSKET
Word Meaning:
MUSKET — A kind of firearm formerly carried by the infantry of an army, originally fired by means of a match, or matchlock, for which several mechanical appliances (including the flintlock, and finally the percussion lock) were successively substituted; ultimately superseded by the rifle.
Definitions from Wiktionary.