ShadeStrider

So adding Swordmen to a setting dominated by Machine guns and Pistols... Giving the average human the potential to react to and parry bullets, making Swordplay useable in a gunfight.

A Decent Swordsman in a setting dominated by guns would have to be able to deflect bullets as if they were second nature.

If we want to add Swords, then the Story has to be Sci-Fi or Fantasy. In real life, Swords are invalidated by guns completely. Military men use guns and bombs. In Close Combat, most people use knifes and their hands. But in Fiction, we aren't constrained by physics.

Final Fantasy and Metal Gear games starting in the Shadow Moses time period do it regularly. 

Who knows, maybe we'll eventually find a metal that is strong enough to withstand gunfire regularly, and humans will evolve to the point that we can move and react faster than the Speed of Sound. But I doubt anyone who posts on this website will be alive to see it.