1. I'm Thinking +3 Prof (Superior Weapon), 1D6 Ranged, 2D4 Melee, 15/30 Range, How would it work though?
2. I'm Thinking +3 Prof (Superior Weapon), Fires Magic Missles, 2D4 Melee, 20 Range
What would the stats and mechanics be for a DnD GunBlade like Leon's?
1. I'm Thinking +3 Prof (Superior Weapon), 1D6 Ranged, 2D4 Melee, 15/30 Range, How would it work though?
2. I'm Thinking +3 Prof (Superior Weapon), Fires Magic Missles, 2D4 Melee, 20 Range
I would suggest finding the thread with guns. It also included a bayonet. I think it was called the firearms workshop or something, anyway, it seemed to do a good job, and would allow for some variety.
In FF8 I believe two kinds of gunblades are explained in minor detail, and the more common version does not actually fire rounds, and could actually be accurately represented by the High-Crit property.
As I understand, historically and in Leon's case, the gunblade doesn't shoot as a normal gun would. Their accuracy is nothing to write home about, unless that letter goes "I didn't shoot anyone today". Typically, the gun is fired after stabbing someone, at point blank range, to increase the severity of the blow. If the gun was fired alone, it wouldn't be done more than a few steps away.
The way I'd go about it would be to try and wedge it into the existing rules and abstract it. I would use an exotic weapon with stats based on whatever sword it is modeled after (we'll say 1d8 heavy-blade with the versatile property), and add the high crit property. The high crit represents critical hits being solid blows that open the target up for an extra, undodgeable gunshot.
It's probably overly simplified for what you might be hoping for, but it avoids any need for special rules.
Edit: Yeah, what Sinasilver said.
Or, you could go the enchantment route and have the normal weapon enchanted with a property which deals extra damage per plus on a crit.
There are several ways you could do that, including just using a Vicious weapon as-is. I think the less actual tinkering you do with the base weapons, the better.
I might be inclined to make a magical version a level 6+ enchantment; 1d8 per plus on crits, and 1/day you can shoot for weapon damage as a ranged attack to a range of 5/10 with an additional [w] damage. Something like that.
Current Stat Ideas: Rates
:D 
1D8 Versatile high crit. Rating
Why: Might as well picked up a greataxe1D10 Versatile, Once encounter Shot dealing 2D4. Rating: :D Whay: Gets What i think what should be a GunBlade and quite good, balanced for the superior.
Or two Types (Or two Modes a magic enchant?)
1: 1D10, Versatile High Crit
2: 1D8, Versatile Ranged attack?
Well, How about a 1/ Encounter Fires a 2D4 shot?
Current Stat Ideas: Rates
1D8 Versatile high crit. Rating
1D10 Versatile, Once encounter Shot dealing 2D4. Rating: :D Whay: Gets What i think what should be a GunBlade and quite good, balanced for the superior.
Or two Types (Or two Modes a magic enchant?)
1: 1D10, Versatile High Crit
2: 1D8, Versatile Ranged attack?
But a Bastard Sword is just a plain 1d10 versatile Superior Weapon. Your version 1 is clearly superior.
1D8, High Crit, Versitile, 1/E 2D4 ranged attack.
What would the stats and mechanics be for a DnD GunBlade like Leon's?
1. I'm Thinking +3 Prof (Superior Weapon), 1D6 Ranged, 2D4 Melee, 15/30 Range, How would it work though?
2. I'm Thinking +3 Prof (Superior Weapon), Fires Magic Missles, 2D4 Melee, 20 Range
+3 Prof, Superior, 1d8, High Crit is how I would do it.
Off Topic:I posted in the RP RESPOND!
Gunblade
2H, Superior Weapon, Heavy Blade
+3 Proficiency, 1d8, High Crit
Cost: GP 30 Weight 8 lbs.
Any objections?
Special: The following feat.
Longshot
Requirement: Gunblade Proficiency
Effect: You may make a ranged attack with a gunblade. Doing so the weapon has a +2 proficiency bonus deals 1d6 damage and loses the high crit property. It has a range of 5/10
Reworded:
Longshot
Requirement: Gunblade Proficiency
Effect: You may use gunblades in a new way. It gains the following weapon entry.
Gunblade
2H, Superior, Ranged
+2 Proficiency, 1d6 Damage, Ranged 5/10
But seriously, gunblades are a terrible idea for a weapon. So awkward, terrible aesthetics, and totally pointless.
You take your sword, I'll take by Gunblade, we'll see who wins. And if all else fails the following feat:
Longshot
Requirement: Gunblade Proficiency
Effect: You may make a ranged attack with a gunblade. Doing so the weapon has a +2 proficiency bonus deals 1d6 damage and loses the high crit property. It has a range of 5/10
Now take me on! :D
There's nothing wrong with adding some more "fantastic" weapons to the game so long as they are roughly balanced against the other weapons. The gunblade really is just a suped-up scimitar.
Oh and the gunblade now has a group in my previous post.
Really? How about a shotgunblade?
You take your sword, I'll take by Gunblade, we'll see who wins.
How about you take your Gunblade, and I take my Mayor Hagar, and we'll see who gets his face ruined.
But now that I've come up with the rules these things are going into my game. Just have to get them in...
Too bad my Kobold can't use one.
In any case, why not have your kobold become a pirate, wield a gunblade, and ride around the world on a cyborg kung-fu master tyranosaurus while fighting off a legion of laser-toting ninja cowboys so you can finally defeat the robot zombie king?
I was going more for Cowboy than "totally tripping"
It's house-rules; we don't need hate, we need honest critique.
And anyway... I made the Gunblade 2H so that small creatures don't have the "when it fires do I fall down" question.
What's with the hate?
Not hating. Just joking. I do hate gunblades, but I'm not seriously trying to make you feel bad for trying to stat them. Plus, I wanted an excuse to use pirate, ninja, zombie, robot, tyrannosaur, laser, and kung-fu in the same sentence.
Why do you hate gunblades anyway? As an idea to implement in the game they seem kinda cool. I'm a FF fanboy so you'll have to bear with me. I'm also a sorceror and Changeling (read any transmutation effect) fanboy so I can get... ADD is the word you think? Definitely ADD.