The new Elite Codexes system (currently in the CTE) is a good idea DICE. But it shouldn't be restricted to only 8 primary weapons for reaching 500 kills, it should be for:
1. Every single weapon in the game and
2. Every single vehicle in the game
3. Every single class in the game
To limit it to certain weapons only isn't just because not everyone plays with those weapons, everyone has his personal most loved weapon(s).
Down below my previous suggestion, but for every 500 kills is even better for sure!
Original Quote from last CTE patch:
"It is now possible to unlock an Elite Codex for eight of the available primary weapons in the game. All you need to do is get 500 more kills per weapon. Not only will you get a shiny Elite Codex, but you will also be awarded 25000 bonus XP. Not bad when you’re chasing those new max class ranks."
My original post:
How about 10000 xp for 1000 kills achieved with:
a) One certain weapon and (for instance 1000 kills with hellriegel, 1000 kills with mondragon etc.)
b) One certain vehicle (for instance 1000 kills with light tank, 1000 kills with attack plane etc.)
I just reached 1000 kills with calvary and noticed it's only 1000 xp for every 100 kills, but no extra reward for 1000 kills with same vehicle or weapon is being given. And 10000 xp isn't to much for 1000 kills.