The MS-14B Gelgoog High Mobility Type was essentially a standard Gelgoog equipped with a more powerful thruster pack, greatly increasing its speed and mobility. The Gelgoog High Mobility Type was equipped with a twin beam sword, a beam rifle and a shield. It is able to store the beam rifle or bazooka on a storage rack, which looks like it is attached to the backpack.
When the Principality of Zeon military began field testing of its MS-14S Gelgoog prototype mobile suits during the last weeks of the One Year War, it was already hard at work on variants of the powerful new Gelgoog line. One of the first variants to be produced was the MS-14B Gelgoog High Mobility Type. Only twelve of the original twenty-five MS-14Ss would be modified into this B-type during field testing by the Chimera Corps, which included Zeon's famous "Crimson Lightning" ace pilot, Major Johnny Ridden. When the Gelgoog line went into mass production, an additional 55 B-type Gelgoogs were produced, participating in the Battle of A Baoa Qu at the end of the war.