User blog comment:N7/Battlefield 3 Beta is an older build of the game + Changes from Beta to Final game/@comment-1647479-20111003215634/@comment-1990578-20111004204450

It is fast. I'm rank 24 after 12 hours of play.

And why would you use a mortar in a subway, anon? I'd imagine it wouldn't work too well, even if it had a lessened trajectory like the BFV Type 63 and M1.