Technology & Combat Characteristics
The "GN021XN XN Unit" is a set of upgrade parts for turning the GNR-010 0 Raiser into the GNR-010/XN XN Raiser. However, it is also possible to attach the entire XN Unit onto the back of the GN-0000 00 Gundam, resulting in the "GN-0000/XN XN 00 Gundam". While this deviated from the original usage of the XN Unit, it was conceived as a second plan to test the usefulness of the XN Unit's weapons when used by the 00 Gundam. The XN 00 Gundam retained the GN Sword IIs and GN Beam Sabers of the 00 Gundam, while adding a pair of GN Buster Sword IIIs stored on the XN Unit to the mobile suit's armament. Additionally, the XN 00 Gundam can use the pair of sub arms located on the XN Unit to mount its portable weapons, and even deploy these sub arms as a second pair of arms, enabling it to adopt an unconventional fighting style using four arms. Unfortunately, with the adoption of the XN Raiser canceled, the XN Unit was never built, so the XN 00 Gundam only existed as design data.
History
The GN-0000/XN XN 00 Gundam only existed as design data as the GN021XN XN Unit was never built.