My thoughts on the subject that I have stated multiple times is why not have a Transition period. What this would entail, would be to allow a slow evolution of firearms by way of a transition. We already know that crossbows can fire an arrow Irp, and we know of the existence of gunpowder. Maybe begin with something similar to the firelance. What this is, is a literal lance, with a tube of Bamboo, in this tube of bamboo would be filled with gunpowder, a wick, and would fire glass shards at high speeds. Much like a Glass shotgun. Work from there towards bringing flintlocks, maybe say over the course of a map, this allows events to be made to bring in the introduction of each, or to simply allow players to evolve it naturally. All in all however, I am in favor of bringing guns to LoTC.