If you want an overview of minifigure weapons Lego has used over the years you can get a pretty complete picture here: https://www.bricklink.com/catalogList.asp?v=2&pg=1&catString...

Even though Lego sets do sometimes include weapons, even very gun-like weapons, to me there is still a pretty clear line Lego draws. Their City sets don’t include guns and guns are the exception, not the rule, otherwise.

Look at Lego’s competitors if you want to get an idea of what Lego could be doing. Obviously those are looking for their niche, so that’s to be expected. They have modern and 20th century military equipment sets and I could never imagine Lego releasing sets like that.