Oh great, now the yandere's got a gun

...a gun?...that's it? pfft...too basic and too easy.

No, that's worrisome. A Yandere with enough common sense left to use a weapon that ISN'T hard to use.

Yuno doesn't need a weapon that's easy to use, Yandere or not. For fucks sake, she deflects throwing knives with a common kitchen knife she carries around with her.