March 31, 2015 3:26 PM EDT
I dont think it would break immersion. I mean, flintlock and blackpowder weapons existed in the real world for hundreds of years. As it was, bows remained the go to weapon long after firearms came in existence because they were cheaper, more reliable and faster to shoot.
I personally would love to see them added. Give them the same trade offs as bows and cross bows-in fact making the bow, crossbow, flintlock trifecta would be like the sword,axe mace one for melee. Bows are fast but relatively low powered, crossbows are middle of the road and flintlocks are powerhouses that take forever to reload.