This is an easy way to create a MAXED out custom class/gun and unlock ALL gun attachments for that gun. You do have to have a level 8+ gun so that you can save the class as a custom mod. Written instructions are below! I hope you guys enjoyed, don't forget to like, comment, and subscribe.
INSTRUCTIONS:
1) Be on multiplayer.
2) Go over to "Private match, trials, & gamebattles.
3) Scroll down to Gamebattles and click it.
4) Go to weapons and the edit load-outs
5) Pick a weapon that is level 8+ to edit and put any attachment you want.
6) Once your done with this, make sure that you are on the attachment tab, and press L2 or LT. This will bring up a save mod screen.
7) Save your mod and then back out to the multiplayer menu.
8) Go to edit loadouts and select the class you'd like to place your mod.
9) Then find your weapon that you chose, and go to armory on it. You will see the saved mod here.
10) Select it and boom. You'll notice that you have attachments set on the weapon that are still currently locked!