It's been a problem for quite some time now, and it's been reported several times. Both as part of the few select weapons that didn't get the silencer back in any way at all.. and as a separate when the rest were fixed.
It's been broken since at least mid July 2018, and that's the time you also got aware of it.
I honestly don't care about that weapon, even as I run an SRSA1 as a main weapon. I got it from a free crate.. But if someone payed real money for the pack where it's included, don't you feel any obligation at all to fix it?
The problem with it is that you could remove the silencer from if with the F-key and could re-attach it the same way.. until you went into the inventory, and the F-key weren't available after that.
And as it's a unique weapon, it can't be opened in gunsmith. so no way to get silencer back. The P227 Urban, among a few others had the same problem. But there you at least 'popped it back on' in the inventory.. at least once, as I didn't bother to keep testing.
Around the time of the X-Bow ammo bug I reported it the first(?) time. Then you fixed it for some weapons (even as you totally forgot to fix the X-bow ammo going away, even as you had a challenge for the X-Bow during that time (were you forgot that 50% didn't have access to the X-Bow even)) Then individual 'unique' weapons got the same problem, also reported with repro and video and the weapons I managed to take apart and totally destroy, and you actually reset 2 of them. The Black Widow were not one of them, and no one sane would main that gun anyway.
But as it's a crate or bought pack item only.. Fix the damn thing.. and my SRSA-1 too while you're at it.
The same thing happens on the SRSA-1.. But there we at least have access to the 'Gun-Smith' Enter inventory.. and the silencer can't be re-attached the normal way..or any way at all.
Second video is me applauding you in advance, for fixing it.. by the time of GRW 3 release? So ignore that one until you fixed it..
Spoiler: Show