I'll try to clarify with an example.
Let say I buy a Forward Grip certification for the AF-19 Mercenary under the "Weapon" tree of the Engineer, will it also be available for the Light Assault class, since they have that same default weapon? (AF-19 Mercenary).
Since Certifications costs some point, I wanted to know if I'd have to buy each of them maybe twice.
Thanks a lot!