Covenant Weapons Holder
From Halopedia, the Halo wiki
The Covenant Weapons Holder has appeared throughout the Halo series as a device that has stored the weapons for Covenant encampments. It holds four hand held sized weapons, or two dual-wieldable weapons. It has been speculated that it also acts as a device to recharge plasma based weaponry, as all weapons found in it have been fully charged, but this may just be circumstantial.
Common weapons held by Covenant Weapons Holders include but are not limited to: Plasma Rifles, Particle Beam Rifles, Brute Plasma Rifles, Brute Spikers, and Covenant Carbines.