Activity Unlocks?

Is there a way to get the infinite ammo and other unlocks without having to go through the torture of level 6 activities? LOL I pretty much have no trouble getting to level 4 or 5 and I honestly have tried and put a lot of time into trying to get through level 6 on some activities, but they seem to throw everything they can at me and to be honest it all loses its fun at that point.
 
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