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i have the gun and it rocks. its definately worth the money. get a new barrel first trigger frame second and from there on its ur personal preferece. u mean 20oz not 2oz? invest in HPA. cockers will work ok on co2 but ull want HPA for more consistency and performance. its already timed but unless u fiddle with it or put on a new trigger or something then ull have to retime it. for timing info go to paintballravi.com.