GTW ML-16 Laser

The ML-16 is a Primary weapon which was in heavy use before the appearance of the Shivans and their shielding technology. The ML-16 works adequately against hull and devours only a negligible amount of energy, allowing the pilot to divert more power on engines.

Wiki comments

The ML-16 is an acceptable weapon at the beginning of the main campaign. Unfortunately, after shielding on fighters become common, the weapon losses its efficiency. Prefer the Avenger to this weapon.

You will see more of this weapon in the Terran-Vasudan War Project