Forum:How far along the game do you have to be to become trained w/ the assault rifle and sniper rifle?

I've put in a solid 9-10 hours of game play including taking down matriarch benezia and the hades gamma cluster missions, but still have to use my pistol and shotgun. What point do i have to reach to use my assault rifle and sniper rifle, as they are both still listed when i hit the left bumper as "untrained"?