First get WillowTree as you will need this to "Mod" your saves.
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You can mod your levels and everything under the tab "General Info"
its pretty much self explanitory, but for gun modding i'll give you a tutorial.

in willowtree many people mess up guns because they are not "Legit" by the game. the game has checks to remove "Hacked" weapons, like if a sub machine gun has a sniper rifle's barrel it will not accept the weapon and delete it.
so how do you make sure it doesn't get deleted? make sure all the manufacturers parts are the same first of all, otherwise it will reject it, secondly don't add different weapon types to a weapon (ex. sniper + shotgun)
now, once your done making your weapon(s) (if you didn't start and find it confusing keep reading down i'll give a stoopid peoples tutorial) hit export [To clipboard] then copy + paste it on this tool (it can check to see if weapons are legit. Gear Calculator hit import and paste the code. then the weapon will appear (its not perfect so yeah ) and say its legit or not, if it finds out its not legit check the button "Auto Naming" its right above the calculate button, gear calculator can also be used to create guns from scratch. just click on what you want to change and a drop down menu will pop up and you can pick whatever items you want, and in the bottom left after picking something it says the stats of it, like damage +50% or something. [tip:barrel 4 usually gives the best damage] hit calculate to see what damage/everything it'll do. to get the gun on your save hit the code tab right above the weapon, copy the text and on willowtree go to the weapons tab and hit "new weapon" then select it and hit "import from clipboard" adjust the level, and MAKE SURE YOU HIT SAVE CHANGES TO THE WEAPON. then once your done, save your profile in willowtree and put it back on your xbox. then play

Here are some weapons i made you guys might find good.

Gun 1: Malevolent Savior (ammo regen SMG)
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Gun 2: Combustion Hellfire (SMG with x4 fire damage)

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Gun 3: Punishing avenger (ammo regen combat rifle)

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Gun 4: Pearl Aries (revolver with transfusion effect)

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Gun 5: Desert Penetrator (Fully automatic sniper)

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Gun 6: Double Anarchy (SMG that fires 4 bullets at once)

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Gun 7: Glorious Serpens (fully auto x4 corrosive Assault Rifle)

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Gun 8: Detonating Cobra (x4 Explosive sniper)

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Gun 9: Punishing Stomper (very strong combat rifle 3round burst)
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Weapon 10 Fearsome Bessie (Very Strong sniper)
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Weapon 11: Pestilent Defiler (x4 corrosive revolver)

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Weapon 12: Pearl Chimera (Revolver with every elemental effect)

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Weapon 13: Fire (quick firing burst rocket shotgun[Friendly Fire + Boomstick Merge]

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Weapon 14: Pro5 Protector(ammo regen average funny looking repeater)

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weapon 15: Lightning Invader(awesome repeater if you zoom in it burst fires rapidly[all the bullets] and its x4 corrosive and x4 shock[with or without zoom]

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Weapon 16: Bone ShredderSavior(Ammo regen Boneshredder+Savior[its still a legit weapon]

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Weapon 17: Double Stalker(Beast Repeater with awesome damage fire rate and bullets that bounce off walls)

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Thanks, MoDzxNeX