All the talk about the guns, in the book it said the gun was a way too big for her, so an uzi-like weapon doesn't make sense. The author likes Warhammer 40k and stuff, making him a rare one to put guns in his books. Another gun-centric Isekai was Villager A will Save the Villainess No Matter What (which is a little derivative of this series). I think that manga handles the guns better...
But with how rushed and condensed the finale for volume 4 is being I am worried this series might be facing the axe and the mangaka is trying to get to a good stopping point.