Gunslinger trophy requirement - Get 10 kills with each of the ten Back to Karkand weapons.
The 10 Back to Karkand weapons are the 10 weapons unlocked by completing the 10 assignments.
Racking up 10 kills each are still okay but some of the assignments will be tough.
Note that this is a glitched trophy and the glitch is that kills for FAMAS are not accumulative for others and that kills for FAMAS need to be done last and within one round.
I am pretty sure of the non-accumulative nature as I had more than 50 kills before doing 10 kills in one round to unlock.
Does it need to be the last weapon? I am not sure but it does not hurt to leave it to the last.
Tip : For PS3, find one of the servers with high tickets (at least 200% of original tickets), small maps such as Metro / Grand Bazaar where you will spend more time fighting rather than running around or using vehicles or killed by vehicles.
