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From my experience the open bolt has been reliable and accurate. At first I purchased the we pdw closed bolt and immediately experienced double feeding issues, horrible accuracy and poor hop up adjustments. After purchasing the open bolt kit all of my issues went away.
As for power there is a video from RA tech stating that the open bolt kit increased the scar's fps by 100 fps. I think it is outrageous that they claim 100 fps but I will say that there is a fps increase. I've tested this theory myself with a closed bolt scar and my open bolt pdw. The scar with .25g bb's was chronoing an average 380 fps while my open bolt pdw with .25g bb's was chronoing an average 430 fps (15 degree's celcius)
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