Be careful hitting buttons when upgrading weapons while attachments are attached...

[Kai]

My silencer on my Buket SMG basically vanished and the barrel modification is undone, forcing me to pay for it, so i reloaded a older save.

I remember upgrading laser and scope addon for it but it acts as if i don't own it.

[Kai]

And right as I said that and went to a previous side quest stash, took items, and found another bug, a 'completed' sidequest became 'incomplete' and shows up on the map now... "Budmo" lol, where you put vodka in 3 stashes.

[LaggyLagg]

I accidentally sold an M10 (Mac10) with its high-capacity mags still attached quite a while ago, and it's pretty much lost forever.

[Kai]

Yeah the upgrade UI for this game is buggy, the system behind it even more so, so your items may lose a upgrade, but if you hit U and look at the upgrade menu from outside the vendor, you can still see it visible.

But the game treats the module upgrade as non-existent, meaning my Buket has neither laser designators, nor scope to mount on it.