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
YKM Light Flash Guard
Muzzle
Added in version 1.0.15.0 1.0.15.17
Made by YKM. Suppress the fire light. Improves the ballistics stability at the cost of range.