This is the Bandai HG 1/144 Gundam Heavyarms Custom [5068840]

Bandai announces the "KAI" version of the HGAC 1/144 Gundam Heavyarms! It shares the same molds with the regular release version of its variant, with newly molded parts for its backpack - adding two more vernier units making it possible to manoeuvre in space.

Its skirt armours are also given a new mould to make an accurate representation of the unit. The "KAI" version will of course not be completed without its twin beam Gatling installed on its left arm.