Do you have this issue with other weapons and other games (Battlefield 4 for example)? Also, if you have another Xbox controller, please check it.
I know what the problem is. It is not the game but the command. The R2 / L2 buttons have a contact with the silicone with a sharp base and this causes the silicone to be cut off and the silicone will end up not having contact with the electronic board and so the gun will not fire. But automatic weapons do not need such intense contact to fire the shot it leaves without any problem.
The solution I got was to change the silicone from the left side L1 / L2 to the R1 / R2. The cut of the is smaller and so can play without problems, until it is totally worn out with its use. After that I can only solve the change / change of buttons by going to the PS Menu Settings and then Control Assignments. There you can switch the controls from L2 / R2 to L1 / R1. As in the game settings you can not make this change and Playstation itself, with an update, decided to do so.
I can not, until now, solve another way to arrange a way to play without being done this way.
