M870 Rampart point defense turret (Earth-5875)

The M870 Rampart point defense turret is a defensive naval weapon used in warships of the UNSC Navy. They fire 50mm rounds, and were developed during the First Contact War as direct countermeasures against Covenant plasma torpedoes.

Description
M850 Ramparts are armed in Charon-class light frigates, Gladius-class heavy corvettes, and Stalwart-class light frigates.