Maybe you already know. Maybe this is a bug just for me. But when I'm customizing my Security Breacher class, the weapons Uzi has 2 compensators available. As they are exactly the same, I think it is a small bug in the game.
Hope it helps.
About the game, I have not played too much this Beta, yet. So, the only thing I can say is that the game seems to be more optimized now compared to Alpha. But I need to play more to have a complete feedback.