There is seems to be a problem with the Feline in my game that it will not let me earn any unlock points for it. I have several other guns that work fine with unlocking (besides the random having to unlock again), and I know that attachment unlocks are at 20, 50, 100 kills and so on. I have well over 100 kills with the feline, but it has yet to give me the achievement for 20 kills. Very frustrating.