Ancillary weapon
Encyclopedia
An ancillary weapon is a weapon used for secondary or auxiliary purpose, such as a bayonet
Bayonet
A bayonet is a knife, dagger, sword, or spike-shaped weapon designed to fit in, on, over or underneath the muzzle of a rifle, musket or similar weapon, effectively turning the gun into a spear...

. Such weapons are usually equipped with less firepower than the primary weapon. The usage of ancillary weapons most frequently occurs when the primary weapon becomes inoperable or ineffective due to shortage of ammunition or when a battle becomes close quarters combat. Many modern weapons/vehicles are equipped with ancillary weapons, including tanks or even assault rifles
Assault rifle
An assault rifle is a selective fire rifle that uses an intermediate cartridge and a detachable magazine. Assault rifles are the standard infantry weapons in most modern armies...

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Police and security professionals are often trained or encouraged to carry a back-up handgun in case there is a malfunction with the duty weapon. These back ups are usually smaller in size and caliber. This second gun is another type of ancillary weapon.
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