To start, I know that this issue has been brought up before, but searching through the forums hasn't helped answer my specific question.

I understand that due to some stupid error, I should be using upgrades and unlocks at the lobby menu and not at the multiplayer menu because otherwise it won't save. Having said that, i just got to level 13, which is supposed to give me a weapon unlock, and I wanted the grendel. It doesn't have a lock symbol next to it, but I can't choose it - meaning I don't have a weapon unlock. But aren't I supposed to get a weapon unlock at 13?

I'm very frustrated, and I would really appreciate it if someone could help me out and tell me what to do. Thanks.