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Hopefully by this time I have 75 kills with my USP, at which point I switch to my tac knife commando class:
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For this reason you will probably get Mastery on a gun before Steady Aim Pro VI, at which time I recommend you use a different SMG or Weapon to finish off Steady Aim Pro. And even though Marksman VI is 500 kills you won’t get them at the same time since a lot of your kills are going to be aiming down the sights. Steady Aim Pro VI requires 500 hip fire kills which is not that hard to do with an SMG.
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The 2 most important primary weapon challenges in my opinion are the “Marksman VI” challenge (get 500 Kills with the weapon) and the “Mastery” challenge (Unlock All Attachments for that weapon) Looking at this Challenge EXP Chart you can see that most guns have the same challenges and the same experience earned to reach those challenges. The best utilization of the current leveling system I can see is to try and get the highest experience yielding challenges that take the least amount of game time to achieve and doing them in an order that allows you to work on multiple challenges at once. The total amount of experience needed to prestige in MW2 is 2,516,000 And because you can work on a lot of the challenges at the same time, you can utilize the new leveling system to get through a prestige faster than you would think. The major difference between leveling in COD4 & leveling in Modern Warfare 2 is the amount of challenges that MW2 offers compared to COD4.