Bandai HG #23 1/144 Demi Barding Mobile Suit Gundam: The Witch from Mercury

The MSJ-R122 Demi Barding (デミバーディング) is a mobile suit introduced in Mobile Suit Gundam the Witch from Mercury. 

A new prototype MS and the latest model developed by Burion as part of the Demi series. The Demi Barding is a concept model used for the purposes of testing and development. Although it has new components designed to meet the latest standards, the general structure of its propulsion unit is identical to the current production models. The unit was built without profitability in mind, and as such has higher than normal specs. However, ease of maintenance and other characteristics of the Demi series was still incorporated into the design.