I saw a thread in the PC section bringing this up(FROM A YEAR AGO) but I wanted to post this here on the off chance it might get seen and possibly fixed. The problem is when you join multiplayer, the TAC 50 starts doing 1% of the damage it is supposed to do. For example, in single-player, it lists its damage as 198.7k but in multiplayer, the damage drops to 1490. Essentially this makes the TAC 50 useless in the multiplayer setting.