In rpgs guns have a tendency to get simulated to pornographic levels. Luckily I know next to nothing about guns besides that they shot bullet.
Or I say that. I've already taken this entire post, crumbled it up and threw it in the garbage at least two times now because I thought my systems were too complicated.
But no worries. Something about three times and this time I'm not reinventing the wheel. I'm just taking it down a different road.
So yes. Guns are magic! What does that mean? Well to be honest it means guns are reskinned spells. Now I know that sounds boring but stick with me here.
Have you ever wanted to have an on demand Burning Hands? Hmm? How about a one time use fireball that doesn't require a weird wizard to read some squiggles of a piece of parchment? What do you think of that? I don't hear a guffaw! Well shotguns and grenades are at your service!
OK that's enough of the snark. So yes guns are reskinned spells but that idea is pretty cool by itself. But what about the poor wizard? Well if he's as smart as the rest he'll be using guns too so he doesn't have to worry about his precious class protection.
What I find the coolest about this idea is that it can apply across multiple games, albeit that they have some sort of magic system. So if shotguns are Burning Hands in your games you can keep them functionally similar between your 5e game and your LL game.
However these reskinned spells must be kept within reason. After all they're just guns. 5e's Burning Hands can deal 3d6 to up 6 creatures and that's pretty powerful for an on demand shotgun, even with a save for half. I'll make it an attack instead and the number of adjacent creatures hit a d5 to nerf it a bit.
And by grod's beard if you want exploding dice let them explode!