Unlock conditions for certain weapon perks?

[IceBeam]

The perks listed below were unlocked automatically for me. As a result, I can no longer see under which conditions they become available.

1. Combat Shotgun [T2]: Extended Mag (level 8 perk)
   
2. Bullpup Rifle [T3]: Ergonomics II (level 9 perk)
   
3. Classic Battle Rifle [T2]: Bounty Hunter (level 13 perk)

I suppose that these are document-related perks, and my guess would be that:

1. Combat Shotgun's Extended Mag requires collecting 1 document for the Rome 2 chapter.
2. Bullpup Rifle's Ergonomics II = 1 document for the 3rd chapter of Jerusalem. Alternatively, it could be Jerusalem 2.
3. Classic Battle Rifle's Bounty Hunter = 1 document for the 2nd chapter of Jerusalem. Otherwise, it could be Jerusalem 3 or Moscow 2.

If you happen to know what the unlock conditions for these perks are, feel free to leave a comment below this post. Screenshots of the perk descriptions with unlock requirements would be the most helpful information.

I would also like to know a few details about the Thumper Grenade Launcher.

• At which levels do the perks named "Incendiary Grenades", "Flying High", and "Friend Not Foe" get unlocked?
  
• At which levels do the first two perk slots (1 unique and 1 common) become available?

[^9[DSS]Dahaka]

I have all documents, and beaten all chapter on max diff, so the weapon perks just unlocked for me as I leveled em, then my friend fired up the game, and he was like "what? I need all documents of a chapter?"
Thats how I found out. I'd love to know the requirements for each weapon perk as well. Maybe someone could test and write it down in the WWZ wiki page?

[IceBeam]

Originally posted by ^9DSSDahaka:

I have all documents, and beaten all chapter on max diff, so the weapon perks just unlocked for me as I leveled em, then my friend fired up the game, and he was like "what? I need all documents of a chapter?"
Thats how I found out. I'd love to know the requirements for each weapon perk as well. Maybe someone could test and write it down in the WWZ wiki page?

I have been adding tables with perk-related information to every weapon page on the Fandom wiki, and this is one of the reasons why I'm asking these questions. So far, I have found no comments / screenshots / videos featuring those perks with their unlock conditions.

[^9[DSS]Dahaka]

Originally posted by IceBeam:

Originally posted by ^9DSSDahaka:

I have all documents, and beaten all chapter on max diff, so the weapon perks just unlocked for me as I leveled em, then my friend fired up the game, and he was like "what? I need all documents of a chapter?"
Thats how I found out. I'd love to know the requirements for each weapon perk as well. Maybe someone could test and write it down in the WWZ wiki page?

I have been adding tables with perk-related information to every weapon page on the Fandom wiki, and this is one of the reasons why I'm asking these questions. So far, I have found no comments / screenshots / videos featuring those perks with their unlock conditions.

Oh you are an editor? Very nice of you, thanks for your contribution. If I had time i'd backup my save and reset to check the stuff out with a fresh save. But i'd need to level up all weapons from 0 to level 15, and that would take me about 48 or even more hours. So I cant do it....