Brovo said
A rifle with a bayonet would be more practical than a gunblade in this universe, as gunpowder weapons are still a fair bit of a rarity. Gunblades aren't entirely eliminated, but it would be... Ill advised to start with one. They tend to be exotic to the extreme. Besides, you can remove bayonets to make them impromptu daggers. If something gap closes you and brushes aside your gun blade, you're a goner.Aside from that, yes, a spellblade is someone who can imbue their weapons with magical effects, this is usually more effective on melee weapons, though there is a ranged variant that specifically affects ammunition, called , which is something to keep in mind, though it does require mage training.
In this case, my concept is basically a sword with a long-barreled pistol fused to it; certainly unfit for any kind of distance work, but a close-in shocker. It's a sword first, firearm second, and has a much different role than a rifle. I wouldn't ever imagine deliberately drawing the entire thing just to take a shot at somebody; the gun's pretty much there just for a little zing in a close-distance encounter. It'd probably never get used in a typical occasion. Used in a two handed, half-swording style, I wouldn't think any added weight from the gun would be a major hindrance to the control of the blade.