Here are some very useful charts to show you the damage of each individual weapon as well as all the attachments. This should help you to choose which attachments to use with each individual weapon. These are all up to date with the current patch. Most people are still using foregrip on all of their weapons without knowing the penalties. I stopped using it and my accuracy has increased. Have a look and you will see why ........... it's been nerfed BIG TIME!! Hope this helps guys
edit: I guess I can't post links for 7 days so just copy paste these into your browser.
edit: I can't find the sniper attachments chart, but snipers suck anyway .. lol
Enjoy
Damage Chart
symthic.com/?s=bf3&sb=beta
Assault attachments
docs.google.com/document/d/1wz_KvOD-7B5sTx2SItHDO3qv5U7DvOFCrBT0TCPAoHw/edit?pli=1
Carbine attachments
docs.google.com/document/d/1xWpzP8cZstC-hBWr4nxhROrEaK-LYwghvKTgtDK_oZ4/edit?pli=1
LMG attachments
docs.google.com/document/d/15XFRlIbMk9qInMvAM3-9nrkPW0ErkA6cvq-PLd6N6BM/edit?pli=1