HMG-38 heavy machine gun
From Halopedia, the Halo wiki
Template:Weapon The Heavy Machine Gun 38, otherwise known as the HMG-38 Rifle, is an older-model weapon. It was originally used by the Marines of the UNSC. As of 2525, these weapons were obsolete. However, they have entered the firearms smuggling black market. These weapons were used by the Eridanus Rebels.
