The RMS-179 GM II Semi-Striker is a custom RMS-179/RGM-79R GM II. The GM II Semi-Striker was created by reusing spare parts from existing machines, its model number is unchanged. However, by its appearance, it is known as the "Semi Striker." It shares the same performance, power output, acceleration, and sensor range as its archetype.
The GM II Semi-Striker's regular left and right shoulder armor are replaced with the RGM-79FP GM Striker's heavy shoulder armor. Its left arm is equipped with a shield similar to the FA-78-1 Gundam Full Armor Type. The GM II Semi-Striker is usually equipped with a pair of 60mm Vulcan Gun and a beam saber. It is also armed with the GM Striker's long twin beam spear that was based on the RX-78-2 Gundam's beam javelin.