Go to "Community", then to "Clan". Create your clan then go to the armory. You should now have at least two new weapons. Note: You do not have to invite anyone into your clan to get the weapons.

Select the indicated country for your clan to unlock the corresponding weapon.

Ameli Machine Gun: Spain
FAMAS G2 Assault Rifle: France
GMP Submachine gun: Germany
IW-80 A2 Assault Rifle: U.K.
SCFR-LW Assault Rifle: U.S.