[2022] You need 50 kills with AEK971 to unlock it! And to unlock the AEK971 used for unlocking, you need to kill 50 with AEK971! Furthermore, to unlock AEK971 used for unlocking, you need to kill 50 with AEK971!

There is an AEK for Battlefield 3, as well as Bad Company 2.

You unlock each Era's version separately, and can start with the Bad Company 2 version:

• 200 Kills and Assists with Assault Rifles
• 5000 Damage inflicted with Explosives