Here's a way you could use it:
If you have one of those weapons for example, L115A1.
You enter that code and change whatever you needa change (i'm guessing the value) and change it to the code you want the weapon to say. (Let's take P90 M.C.S for example.)
So: It would look like a P90 M.C.S but it's original code would still be L115A1 once you restart the game because I don't think there's a way to change it permanently yet..