[insert various comments pertaining to @RangerCado's return]
Are those really things you people really want ToadyOne to read?
It definitely makes more sense than basing it on strength. And a bit more than basing it on Dex.
Because they are just arbitrary names. Non-magical damage potential could work if you want something more clear, or Physical Attack if you want to go by Elf's/Pokemon's naming system.
I disagree. Most people who pick up a gun and fire aren't very good at aiming and even an expert can miss no matter how strong they are. And mental capacity is used for making things which is a big part of at least two characters.
I strongly disagree. How precisely does sheer mental capacity directly contribute to creating something more than say technical expertise? It's more a matter of skill and knowledge, furthermore, as far as I see it, it's just a way to let people create things without thinking at all about any of the physics or magic principles behind it. What you are suggesting is a retrogression back to some of V2's issues, where people could just create something using a straight up stat roll that could be easily fudged and which failed to acknowledge any expertise or lack thereof a character has (and as it seems, what a player has or was prepared to research).
Additionally, it is more a case of skill than intellect that would control most firearm uses, you don't NEED to target some arbitrary weak-point when your weapon fires pieces of supersonic metal that cause horrific wounds nor if it's any kind of directed energy weapon potent enough to serve as a complete replacement for a conventional gun. Also most people who pick up any weapon would obviously be rather poor at using it, not just guns, but also melee weapons.
There are exceptions of course, I suppose sniping may do so, but that would still be covered under the umbrella term of "skill", not to mention, last time I checked, all three specialist sniper characters are no longer being used.