M910 Rampart point defense network
From Halopedia, the Halo wiki
The M910 PDN is a 50mm machine gun utilized by the UNSC Navy as a point defense system on its warships. The UNSC Pillar of Autumn is known to have been equipped with 40 M910 guns. [1]
File:M910.jpg
2 M910 PDN guns on the UNSC Pillar of Autumn
