Looks like this manga has been over at Chapter 87? Ending a series in the middle of combat is...terrible, but this was a while ago. Gunota Ga Mahou was one of the first Isekai Manga titles I have read when I was new to the hobby. Years ago, this series was one of the leading series to properly showcase and integrate modern weaponry into the magical world. Guns of various types, explosives, methods, which are enforced with the concepts of the magic world. The story itself is okay, the beginning of this series was superb. The good parts end here, the flaw started to unravel itself withthe story. Development wise, it was the same trope over and over as new girls started to join. The art style was a little odd as it focused on "INTENSE CLOSEUPS" of the characters.

To keep things simple, the only good part of this manga was the Modern Weaponry incorporation. Everything else fell below par and the majority of other Isekai series are better structured than this.