From Halopedia, the Halo wiki
The VK78 fires 6.5mm rounds on automatic, and is fitted via rail-mounting with a recon sight-style optic that can magnify up to at least x3. It is distinctive among human rifles in that it does not share the common bullpup configuration of weapons like the MA40 assault rifle and BR75 battle rifle, in which the magazine is inserted behind the trigger. Instead, the magazine well is located at an angle directly in front of the trigger guard. The design of the weapon emphasizes ergonomics and reliability. The VK78's charging handle is positioned on the left side of its body, just behind a side-mounted ammunition counter. Above the pistol grip is a fire selector dial, with two markings, the former of which is a row of red dots (presumably indicating fully-automatic) and the latter of which is a single white dot (potentially safe or semi-automatic). The weapon features numerous markings, including serial numbers, caliber specifications on the body and bolt carrier, and a small UNSC emblem atop a wedge-like protrusion in front of the top-mounted rail, behind the barrel. The VK78 used in 2560 features a matte black, grey and olive drab finish, with a prominent white strip across the weapon's front end.
The VK78 can hold 20 rounds at one time with an observed 60 rounds reserve. The pickup prompt indicates that the VK78 is a "tactical rifle", with "kinetic" and "auto" properties. This indicates that its rate of fire, while cyclically slow, is technically automatic in the same manner as the M6D in Halo: Combat Evolved and Halo 5: Guardians.
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