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.

Forgrip

Silencer

Flash Suppressor

Heavy Barrel

Source: Symthic Forums

Thanks to Justin for the tip!