[DEF] Weapon Modding Info... and some other helpful info...

When viewing a weapon in inventory, some will have upgrade slots

If a weapon has upgrade slots (4 boxes) some of those boxes may have dashes '-' in them

The Dash means no mod slot is available for that upgrade type yet, but you can add that slot
An upgrade specific Icon in an upgrade slot means the slot is ready to have something added into it

Order of upgrades for slots are:
1. Stock
2. Barrel
3. Mag
4. Scope / Site

Upgrade Mods cannot be used on any weapon. Each upgrade mod is specific to a specific weapon type

Process for upgrading:

1. Salvage Matrix
2. Select Weapon to Mod
3. Add Slot / Break it Down to resources / Destroy mods / Retrieve Mods but destroy Gun
4. Add Mods to gun

The broken down weapons (green currency, and one of 5 currency types in the game) is called Ark Salvage

If you want to watch this full youtube video, it's worth it... all this info above is mentioned in here... it's a 24 min video... and there's much more detail here. WATCH THE VIDEO IN HD and FULL SCREEN.

Defiance FAQ - Part 5/5 - Weapon Modding: http://www.youtube.com/watch?v=ZO74ITJ2af8

Also he has out there the following, which you might find useful:
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Defiance FAQ - Part 3/5 - Character Progression: http://www.youtube.com/watch?v=SaCyfLIpK2k
Defiance FAQ - Part 4/5 - Vendors/Travel/Misc: http://www.youtube.com/watch?v=m_A9WQWpia4