Maybe it's the fact a loli, someone assumed to be young, has so many Military metals which is something older people tend to have.
Also she is supposed to be from the Russian Empire (yeah the Soviets probably used this gun too), so it doesn't make sense for her to have so many soviet styled metals, there is even some with a hammer and sickle. In other words it's miss leading to make it look like a soviet gun when it's a Tsarist gun.