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"I'm not sure if this is worthy of a video but I thought I'd tell the world that the veteran/master gun achievements reset every prestige, unlike MW2. So the old strategy of leaving one ready for early rank ups next prestige don't work. Or, if you just really want it but plan on prestiging, don't bother." - woodysgamertag
So what this means is FINISH YOUR GUN CHALLENGES BEFORE PRESTIGING BECAUSE THEY WILL BE RESET AFTER AND YOU CAN LEAVE THEM TO LEVEL UP FASTER!
example: people leave their high level challenges like 5000 kills with a ump at 4999 kills when they prestige so right as you prestige you get 1 kill with a ump and then get 10000 points and level up a shitload. but in modern warfare 3 they made it when you prestige it will reset your challenges back to 0 kills.