Unless this was tagged incorrectly on pixiv, would this not be a SRG-01 Grungust? Not a SRG-02 Grungust Nishiki? For one the head unit is clearly that of the 01 series Grungust. Let alone having a the Calamity Blade/Keitou Ragouken, not the Doom Blade/Keitou Shungokuken. Lastly the shoulders are that of Grungust 01, not 02.

I adjusted the tags as in the Pixiv picture the tags were referencing SRW 4, confirming this being the type 1/ichishiki