@PeNa1979 and the community in general.
Here is a run down on the current crafting/progressing/looting dynamics.
Lootable Items
All weapons are added to the loot container list for the hardened chest although there are probably some weapons considered 'rarer' which should potentially have lower probability. Clucker rounds can be found in bird's nests.
Progession Items
1. Railgun (Dead Eye Perk Unlock/Electrocutioner Crafting - Snufkin implementation)
2. CrossbowMag (Archery Perk Unlock/Crafting - Snufkin implementation)
3. Thor Hammer (Skull Crusher Perk Unlock/Electrocutioner Crafting - Snufkin implementation)
4. Polearm (Javelin Master Unlock/Crafting - Snufkin implementation)
No other weapons have progression capability.
Craftable Items - Snufkin
1. Polearm (with unlock)
2. Railgun (with unlock) and ammo (no unlock)
3. CrossbowMag (with unlock)
4. Thor Hammer (with unlock)
5. Sticky Grenade
6. Stun Grenade
7. All special ammo (I believe)
Craftable Items - oakraven
1. All weapons (to level 1) and ammo are craftable.
Loot Box Add On
It seems weapons can be 'won' from level 2-6 with <qualitytemplate level="1,999999">. I am not sure what this quality template refers to but I don't recall seeing a level 1 Loot Box Add On weapon. Weightings and probability are also assigned to ticket color and associated to weapon color.
Available weapons are:
Green Ticket - PP-19 Bizon, Quad Shotgun, Turret Auger
Yellow Ticket - Newcomen, Savery, Thor Hammer
Red Ticket - Crossbow Mag, HyperBlaster, Railgun, Vampire Gauntlets
Purple Ticket - Gamma Gun, Kronos XII, Vulcan, Crimson Hunter
This leaves the Sticky Grenade, Stun Grenade, Balrog IX, and Polerarm as non Loot Add On items. As the Sticky Grenade, Stun Grenade, and Polearm are craftable, they are also supported in that way or lootboxes.
It seems that a weapon like the Railgun is supported by:
Crafting
Looting
Tickets
Whereas, the Balrog only has:
Looting
All in all, it's quite eclectic in there, hence giving items at least a level 1 possibility for Xpansion weapons to offset the gain in the Add On.
This is a Borderlands Add On system with traits of 7D2D crafting and progression.
I also appreciate that Darkness Falls has Progression issues as reported by Dre and also Recipe issues with the current set up reported by BabyGravy.
https://github.com/arramus/Snufkin-Weapons-Xpansion-A19-Stable-Test2020Nov10/issues/1
A little chaotic in there at the moment with a few options to bring some order to the chaos.
As such, a little time will be needed to find a balance.