Guns that are hundreds of years in the future and fire programmable matter and can heal the user, explode the enemy, disintegrate them in electricity, make them disappear into the void, cause poison damage with every shot, randomly do extra damage for no particular reason, and can basically materialise out of thin air at the whim of a tiny floating magical robot fuelled by the power of magic light... Can't possibly function any differently to modern guns today? I seem to recall we used to have to manually shove the bullet down the barrel not too long ago comparitively... I'm sure if you showed someone from the 19th century a fully automatic rifle from today, they wouldn't believe it could even function, or at least fathom how.