Sell any weapon

I'm confused as to why I can't sell every weapon I have.

I rarely if ever use the welder, as I dislike being blocked when running.
I understand that some are "class" weapons like the scalpel, but again don't care.

I just want to cash out of everything sometimes to grab that SMG or Shotty.

If I leave myself defence less, well that's my own fault and I can usually scab something in the map anyway.

Sell any weapon