This is about quest / faction related progress items so it contains spoilers;
I have allready modded my Deliverer but since it has this special name and Tinker Tom said it was to make my gun even stronger I figured I'll buy it. With the mod I walk to the craft table, click receiver scroll down and find out it is a basic powerfull receiver,...... I have an advanced receiver on it that came from my trusty 10mm pistol that I used since I picked it up in the Vault 111 at the start and had modified during my 100+ hours of gameplay.
The "Deliverer Powerfull receiver" is the exact same as a regular powerfull receiver and it actually lowers my damage compared to the advanced receiver I have. I do not know if this is a bug or intended but then again if it is intended I dont get why Tinker Tom has theis special weapon mod that is the same as the mods I could pick up from any 10mm pistol since about lvl 10.
So there is my bug / issue hope someone can awnser and clarify this.