![The pro-perk system in bo1 is great. Having to do challenges for a better version of the perk adds to the grind. I also like it because only those that grind for The pro-perk system in bo1 is great. Having to do challenges for a better version of the perk adds to the grind. I also like it because only those that grind for](https://i.redd.it/bzumbvnlwjv51.jpg)
The pro-perk system in bo1 is great. Having to do challenges for a better version of the perk adds to the grind. I also like it because only those that grind for
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