Weapon Manufacturer currently does not crit. (patch 19.5)
The tooltip shows 30% with full ascension crit chance, but no crits ever happen.
Addition to this: it doesn't crit until you switch heroes and and then switch back. Then it's fine.
I can confirm this bug, as well as the part about switching makes it crit again.
Here is some video back up for this one, gotta remember to switch!
confirmed i have well over crit cap and cant get a single crit. tried bringing my self down to 10% crit still no crits. untill you switch chars. confirmed