-3036
AK-117 MOBILITY
WORST ADS SPEED ATTACHMENTS
Barrel
-10
OWC Marksman
Underbarrel
-8
Ranger Foregrip
Muzzle
-4
Monolithic Suppressor
Optic
-4
3X Tactical Scope 1
Stock
-4
RTC Steady Stock
HOW THEY GET PICKED
For this list I went through each weapon's attachments and gather the ones that have negative ADS Speed, and negative Mobility stat change.
I then sort the attachments from highest to lowest, then collect the highest negative Mobility change for each attachment type.
Note that if 2 attachments in the same category have the same change, the first one in the attachment list would usually win out.