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All airsoft are chronied using 0.20 weight BBs as a standard, and if you use 0.25s in a 400 fps AEG, it will bring your fps down to around 380-385 fps.
Using slightly heavier weight BBs will drop your fps and over all range, but improves your overall tajectory. Also, if you work out the joules, a heavier weight BB actually hits a little harder, and tend to penatrate light cover better as well as resist the affects of wind.
SHA DO
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