All major countries on the Old Continent have gun control laws!
Only military personnel, detectives, nobility, and some individuals with special status have firearm permits and can openly possess firearms.
This is why the adventurers Charlotte recruited to besiege the Liemar Detective Agency's seven detectives were all using cold weapons, as lower-level adventurers cannot obtain firearm permits, making it very difficult for them to obtain firearms.
Charlotte had only been the head of the Lucavaro District Patrolling Army for a few days and hadn't had time to apply for equipment from the Central Government Office's Military Logistics Department. The hundred-plus old Patrolling Army members who came with Dobin were all equipped with rapiers and handguns, but the adventurers did not have firearms.