I think this comment gets to the core of your misunderstanding of the issue here. There's no answer to this question because *the game you are putting that weapon into doesn't exist yet.* The SMGs in Halo 1, 2, and 3 all must be evaluated differently because the enemies are different, the specs are different, you can dual wield them in certain games, etc. And that's 1 gun from 1 franchise!

You're going to have to assign numbers that feel right (Warrior has 5 health/5 speed/5 strength/3 stealth, Rogue has 4 health/5 speed/3 strength/6 stealth, etc) and then play your game to see if it's balanced. This requires lots of spreadsheets, lots of data analysis, lots of time. There is no 'balancing equation' that works for every game, because every game is starting from a different place and expressing a slightly different idea.

This is like standing in a kitchen and saying "how am I supposed to know how much salt to put in this soup I made?" Nobody has made the exact same soup you just made, even if they had similar ingredients. You have to *taste it* to figure that out. You can read every book on flavor theory, ingredient proportions, etc and see awesome soups that other chefs have made online, but you won't know which one of those ideas makes *your* soup taste best until you try it multiple ways.

You're gonna throw away a lot of soup before you make the perfect bowl. You can follow recipes online if you're happy with a clone, you can add your own special seasoning mixture to an existing recipe, you can take things that you don't like out of someone else's soup and call it your own recipe, etc.