Weapons and ammunition are stored in an armory, magazine, silo, arsenal or at a weapons or ammo dump. In a home they should be stored in a secure safe or chamber/trigger locked with ammunition locked up separately.
Weapons are kept in Armouries. Ammunition is kept in a magazine. They should not, never ever, be stored together.
An arsenal, a weapons cache, etc. Armoury
Arsenal or armory.
Weapons and ammunition are typically stored in military armories or weapons depots. These facilities are designed to securely house and manage various types of arms and munitions, ensuring safety and accountability. Additionally, law enforcement agencies may have their own storage facilities for firearms and related equipment. In some cases, private security firms and licensed gun owners also have designated storage areas for their weapons.
Arsenal
A notable place where weapons and ammunition were stored in the American colonies was the armory. One famous example is the Massachusetts State Arsenal located in Concord, which was a key site leading up to the Revolutionary War. It housed military supplies and was targeted by British troops in 1775, marking the beginning of armed conflict between Britain and the colonies. Armories served as essential facilities for maintaining the colonies' military readiness.
An army's guns are generally stored in an armory. These areas are often heavily guarded. They can hold guns, ammunition, and other weapons.
armoury
a weapon cache
An armoury is a place where weapons are kept (stored).
Stored in moderate temperatures and low humidity, ammunition can be stored for decades.
Explosive room