BlakeJr, ur missin the point, if done properly, it
won't create any unfair advantage. If they do it right, the game will still be balanced, n all it'll do is create a bit of diversity in the game, which is probably wot DICE is trying to do with it. Like I said, adding mods to a weapon isn't nessicarily goin to make it more
powerful, just giv it more versatility. And no matter how many mods u add to a weapon, it's still goin to make no difference unless the player knows wot they're doing.
eg. Adding a better scope to an M4 isn't going to improve it's accuracy, it's only going to allow the player to see a bit further, but as vet players will know, the further away the target is ur trying to hit, the harder it is to hit, no matter how far ur zoomed in, ur sight-drift in comparison to the target will remain the same, scoping in further simply allows u to see the target that bit better (unless they put in a 'hold breath' feature like FarCry did). So, it balances out, with a betta scope, u may be able to see further, but to hit those targets u wouldn't hav been able to see so well before, u still need to be more accurate. It all comes back to a players skill.
And as to being realistic, DICE has already told us they're primary focus is creating a game ppl will enjoy, realism is secondary. Realism is what this mod is for remember

. And besides, Special Forces soldiers at least,
do change their weapons kit dependent on their mission. I doubt these are mods they buy themselves, they would be provided for them.
So if u really want, u could say that this 'buy' system DICE is introducing will simply give players more of an ability to make their weapons more 'mission specific'. And, for those 'John Woo wannabes', the abilities to use silencers would make even more sence in this mod, seeing as the team is making it so that u don't know who killed u, from where, or with wot, the ability to use stealthy tactics will be all the more useful

. N yes, it
is realistic, just look at the way many Special Forces operate, stealthy strikes, in fast, hit the target, get back out, would work well for in CTF games

, the other team would neva know wot had hit them

.