You're telling me you wouldn't be able to make a revolver out of stone and raw, unprocessed ores? Isn't it obvious that you can use any barrel and metal for a chamber without it blowing up the gun?
Oh what that's that? You can't make a Main Battle Tank with this modern schematic I pulled out my a**? Damn, you Dwarves are useless.
Daaaamn, you guys are still using wooden cups but not plastic? One second, let me go whip up some fresh polyethylene. I'll teach you all how to make it later. It's easy I swear.
The kingdom's getting wrecked? Perfect. I, a teen from a different world, will know exactly what to do. Thanks for trusting me, wise king.
I read the Art of War (knows only like 3 quotes). I know what I'm doing. Your generals with decades of war experience got nothing on me.
Damn the bows aren't doing much damage to them huh? Don't worry, we'll use modern bows. I heard in a youtube comment they do more damage than bullets! Luckily, I looked at the schematics once on the way home from school after tripping over an ice cream slick, exactly at an intersection before I was hit by a truck.
Here, let's add some red dot sights, a suppressor, foregrip and a bluetooth chip for wireless coms and Apple Play.
Wait, this world doesn't have certain metals? Don't worry, I know the perfect composition of them at the molecular level, so we can make an alloy that is 100% similar to them.
ICBMs? C'mon, which teenager wouldn't know how to make them? Aren't you like 1,000 years old? How aren't you even at that level yet?
You want me to stop an illegal drug trade in this fantasy world? Easy. I have a Master's Degree in Breaking Bad. I know how the game works.
/s obviously.
But in all seriousness, it's fun. I really do enjoy seeing fantasy stories introduce modern stuff, even if it's unrealistic as hell (Arifureta comes to mind. But I love it so much). Just slap magic onto it and I'm easily convinced lol.