I hope I'm not seeming too bossy, but is there a reason there's a handheld firearm in a medieval roleplay? The only gunpowder weapons there were in the Middle Ages were cannons, and those came very, very late into them (in fact, cannons are what caused the transition into the Renaissance). The most powerful handheld ranged weapon available during this period is a full-size crossbow, which can cause just as much damage as most guns, but it fires much, much more slowly (as in two bolts per minute slow). A well-made crossbow can also very easily penetrate all armor that a fully armored knight usually wears.