I would say it depends what kind of driver you are. I suspect the k1 may be slightly quicker in the right hands, however at club level I have seen a lot of people improve the most with the xb4. I actually sold the k1 (possibly in haste) to get the xb4 but I have no regrets. It requires no hop up parts and works well out of the box. It is really well made and the plastics are excellent. I feel it has helped me develop as a driver. Hope that helps!
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