arms factory; arsenal; ordnance factory
A factory that manufactures weapons and military equipment. The term is neutral and used in both historical and modern contexts.
There used to be a large arms factory in this town.
During the war, many ordnance factories were operating at full capacity.
兵器 means 'weapons' or 'arms' in general, while 兵器工場 specifically refers to the factory where they are produced.
工場 is a general term for 'factory'; 兵器工場 specifies the type of factory.
Compound of 兵器 (weapons) and 工場 (factory).