arsenal
An officially designated store for weapons, ammunition, explosives, or related military, police, or security equipment.
An arsenal is an officially designated storage area for weapons, ammunition, explosives, and related equipment for use in military, police, and security applications.
The official storage designation and military, police, or security purpose distinguish the arsenal. Its contents can include related equipment alongside weapons or ammunition.
The term describes a storage use here. Manufacturing weapons or exhibiting them to visitors is a different activity.
