MA5D Individual Combat Weapon System

The MA5D Individual Combat Weapon System is the United Nations Space Command standard-issue assault rifle after the Human-Covenant war.

Design details
The MA5D ICWS is an exceptionally resilient gas-operated, magazine-fed, automatic rifle designed to execute close-quarters combat with lethal efficiency, regardless of hostile counter-op environmental conditions or duration of use in the field.

Trivia
Based on the picture that shows the MA5D in a vidoc you can just see the amount of bullets in a magazine; 32 round magazines appear to be returning with this new variant.