While they carry rifles, they are not loaded and are for ceremonial purposes only.
The rifles they use are:
* L85A2 (also known as the SA80) - This is the standard British Army service rifle. The Queen's Guard uses a modified version with a ceremonial bayonet.
The Queen's Guard do not use any other type of firearm for their ceremonial duties. They are highly trained soldiers, but their role is primarily symbolic and they do not engage in combat.