Adventurer, Why Does Your Skeleton Have an AK?

[Sword and magic + modern undead army + cool writing + no pressure on combat power] "May I ask why you chose to be an adventurer?" "?? Aren't you going to expel me as a non-personnel if you say it's inappropriate?" ... Lincoln traveled through time and came to a world of magic, dragons, elves and devils. In order to obtain a formal identity, he could only choose to join the Adventurers Association, and obtained his own profession from the World Tree, the Apprentice of Summoning the Dead! But when he saw the skeleton soldier he summoned holding an AK assault rifle, he fell silent. What's even more outrageous is that others can only release fire bombs once at a time. Is there any justice for you, a skeleton, to directly fire fire bombs? Is there any royal law?