2 - Shanghai (weapons) | Hidden dog tags and weapons Battlefield 4 Guide
Last update: 11 May 2016
QBS-09
QBS-09 is in the room to which you took the first elevator. It is in the room that the first enemy walks out of.
RFB
You can find the second weapon on the statue, more or less, halfway through the mission. It is in the main vestibule after the stage where you had to defend the chopper.