They do need to explain these things better...should you go by description or by charts showing damage, accuracy, etc???
Also now that there is change with smgs and stock attachment what is the point of even offering this as an attachment?
Thanks for those who can clarify.
Honestly, don't put too much stock in the stats they show in game. I have found that its much more about how a weapon feels than anything else.
Long Barrel just extends the range a weapon can achieve Maximum Damage at.
FMJ is simply for shooting through materials, doesn't really effect the damage.
I find that experimenting with the weapons and finding the right combo that works for you is the best thing to do.