In Battlefield 3 for the PC, PS3, and Xbox 360, there are several weapons and equipment items you can unlock for the multiplayer modes by getting points in co-op mode.
Here are the weapons and equipment you can unlock in co-op mode, and how many points you need to get to unlock them.
63,000 points – MP412 REX Pistol
126,000 points – KH2002 Assault Rifle
189,000 points – MP7 PDW
252,000 points – M39 EMR
315,000 points – 93R Pistol
378,000 points – SG553 Carbine
441,000 points – G3A3