Because this is a Premium Bandai color variant of an existing model kit, we get the instruction manual for the original Master Grade GM Sniper II:
That means we have some flavor text we can dive into. But I’m not gonna do it! Mwahahahahaha!
In all seriousness, because the OG GM Sniper II released in 2017, it’s new enough that all of the flavor text is in English. If you want to check it out for yourself, you can find it here.