This is a bonus invocation in 5e unearthed arcana: modern magic. Most of the stuff in that are for more modern society based games, but this could work with renaissance firearms. It requires you to expend an invocation slot, but it basically lets you summon any melee weapon or a gun whenever you want. Its up to the gm if he would allow you to take this or not though. If the gm allows it you may be able to make a revolver. However, as the revolver cames after the renaissance it may require Silaka to be a certain level before she can use it.