i got it from the infantry cbt tester achievement
There are a number of weapons that you can only play once you unlock them via this trophy. Afaik it is only for the CBT and has no impact once it properly releases. All the info should be in the main dev post by Stona on this forum. I do not have access to it, so I can’t link it.
oh, ok thanks :)
specifically, you unlocked the sv-98, which you cannot use for the CBT today because it is one of the high BR weapons. since they are testing the low BR ones right now, you will have to wait until they test the high ones again to use it.