In bfbc2 people have enhanced weapons and better weapons like specializations how do i get these?

for example the M14 is Mod O enhanced how do i get the enhanced on my other weapons?In bfbc2 people have enhanced weapons and better weapons like specializations how do i get these?
You have 2 get kills with the wep!In bfbc2 people have enhanced weapons and better weapons like specializations how do i get these?
basically rank up in that class. and if you have other battlefield games you can sign up on the battlefield EA page and unlock some weapons like the thompson the colt and the m1 garandIn bfbc2 people have enhanced weapons and better weapons like specializations how do i get these?
Choose the weapon and kill as many people as possible with it.
you have to get kills with that certain weapon to get upgrades for it.

map of idaho

apa 6th edition