my question is, why a shield and a assault rifle? I mean is she thinking the shield will stop bullets from the bad guys, or that the bad guys only use primitive weapons?

Oh btw my banger looks exactly like that.

I am Wrath, I am Steel, I am the Mercy of Angels.
mors est merces mea – death is my reward
morte in vitam non habet tenaci - Death has no grip on Life.
[Linked Image from i.redd.it]