The recent list of tentative weapon tweaks has been updated with info regarding accuracy plots that will be affected by the various weapon attachments in the upcoming Battlefield 3 patch.
Legend:
Left = Weapon without attachment.
Middle = Weapon with attachment.
Right = Weapon with attachment and forgrip.
Attachments:
Click on the attachment name for a list of all weapon accuracy plots.
Source: Symthic Forums
Thanks to Justin for the tip!