This is Bandai141042 MSA-003 NEMO
The MSA-003 Nemo is a mass-production attack-use mobile suit first featured in the anime series Mobile Suit Zeta Gundam. The design was later updated and featured in the light novel/OVA series Mobile Suit Gundam Unicorn.
The MSA-003 Nemo is a mobile suit developed by Anaheim Electronics that is based upon the Earth Federation's RMS-179 GM II mobile suit. However, since Anaheim Electronics had no experience in the development of the GM series, risks were considered with parts procurement, maintenance, and the high costs that accompanied a completely new design. This was addressed by adopting design features and equipment from the RGM-79SP GM Sniper II, a machine considered a masterpiece that was fielded by Federation Forces and ace pilots late in the One Year War. Although this new suit strongly resembled the old GM II it was far better in terms of generator power, armor material, thruster acceleration, and maneuverability. Additionally the Nemo was able to use already existing weapons such as the RMS-099 Rick Dias’s beam saber or the GM II’s beam rifle, which also reduced the costs to produce these units.
The MSA-003 Nemo could be fitted with a ballute system, allowing the mobile suit to survive atmospheric entry on its own. Once its close enough to the ground the Nemo's thrusters are enough to slow descent, allowing it to land safely. Although not designed for aerial combat because of its lack of flight capabilities, the Nemo is still capable of firing its weapons at ground targets and aerial targets such as the FF-6 TIN Cod as long as the pilot pays attention to altitude. Despite not being designed for aerial combat the Nemo's durable armor and powerful weapons make it a deadly opponent for outdated fighter craft like the TIN Cod.