It's parental control, if you set it on (input a r digit code at the start instead of pressing escape) then there will be no weapon and other stuff will be missing too (this is intended).
If you can't remember the code (or maybe it didn't ask for one) then go to the GG directory and delete all 3 .ini files with parental in their name, then verify and next time you start GG press escape when the parental box pops up asking you to set it up.
If you do know the code then go to the menu inside GG editor "help -> parental control" and now input the code to disable it and then press escape (it will tell you to restart GG)