本当は民間用のFN SCAR 17Sのイメージだけど細かいことはポイポイ
7.62mmを躊躇なく撃ち込むサイドポニーなバトルライフルっ子

It's actually based on a civilian FN SCAR 17S but let's not worry about the details.
Side ponytail battle rifle girl who unhesitatingly fires 7.62mm.