Attachments have changed greatly in Season 13 and need to be manually redone on the site. This will take quite some time, so apologies if this section isn't helpful right now.
Attachment Details
Crossbow - Quickdraw
Underbarrel
Added in version 1.0.26.0 1.0.26.29
Increases mobility at the cost of the stability while ADS'ing and hipfiring.