Mildly put, the SVD is an incredibly powerful gun that's far too widely available in the game. This has a negative effect on balance as an excessive number of players run around with what amounts to a gun that has good rate of fire combined with the ability to one shot players.
Furthermore, the SVD being available to the advisor also cheapens the marksman class, since their best gun is handed out to another class.
It also lowers the value of armour, since it substantially increases the number of players who can one shot through it.
Solution: I would therefore suggest that the SVD be removed from the advisor class and be made exclusive to the marksman class (something that should be the case for all powerful marksman weapons in the future). The insurgent advisor could be compensated by adding in some other gun, such as the G36 or the M4 at a lower price instead.