Weapons are easly added or altered with WillowTree or Gear Calculator software.
There is Gibbed's Save Game Editor that i like using. and a stand alone Borderlands Weapon Editor.
All at borderlands moding resorce - borderlands wikidot http://blmodding.wikidot.com/
Sample-
Basic Guide Lines for Modding:
If you choose to ignore the following guidelines it is very likely they wont appear in your backpack. This is because as of patch 1.30 which keeps out overpowered weapons.
1.Use the same Manufactuer throughuot your weapon or item. No missmatcing. 2.Dont use parts from dlc's unless you have that dlc. No parts from Mad Moxxi's if you don't have Mad Moxxi's. 3.Use the correct parts. Dont use sights for barrels and mags for stocks.
If you wish to get more powerful weapons I suggest experimenting with stock parts.
There is tons of tutorials , worksheets , mostly PC, (there is Xbox)
I have been using this for a while. just remember to back EVERYTHING up!!
