I have to correct myself in terms of the lingering danger of synth infiltrashun:
When I fasttraveled back to Sucktuary, I witnissed the vaultrep and my ammo vendor having a shootout. Aside from the fact that the fag deserved a beating, I thought it was just the usual Bethesda bug. Alas no, turns out the settler was a synth spy (had a synth component) and an invashun force of 10 synths emerged from behind a house. Well, my joy only lasted for a short while, since Bethesda being Bethesda, the whole thing bugged out. Even though every enemy was killed and my settlers thanked me for the help, checking the map after traveling away listed Sucktuary with only 2 people and happiness dropped by 30 points (AKA failed defence). While all my settlers were still present, EVERY object producing food/water/def/nrg was broken and had to be repaired! The amount of resources it took could have build me a spaceship instead.

Tho my crops magically repaired themselves while a was looking at them.
Bethesda. Bethesda never changes.
Moral of the story: Check every settler with awareness VATS for unusual high energy resist and send those to Siberia. Or to the ghoul settlement together with Paladin Derp and Strong. Fuck Strong.
Funfact: You can shoot off the shell from a
mudcrab mirelurk. I heared you can shoot armor off enemies (only saw it on PA raiders), but using the assploding shotgun certainly creates funny moments with naked mirelurks or vaporized ghouls.
The cereal guy's gun is just a renamed relentless .44 revolver. You can slap every normal .44 mod on it. I think it even comes with the lowest receiver, so you should switch that one out ASAP for moah dmg.
I haven't seen any compatibility issues actually, the PPK is a completley different gun and therefore does not accept standard 10mm mods.
The combat rifle seems to have a bug tho, a "glow sight front ring" appears in the list if you have the normal ring attached, but it cannot be chosen.
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