Bearing 35x62x14mm - using 6mm BBs
MetalTac Airsoft BBs .25g Perfect Grade High Precision 6mm BB Pellets
https://www.amazon.com/MetalTac-Airsoft-Perfect-Precision-Pellets/dp/B001BMOBD8/ref=lp_2596464011_1_4?srs=2596464011&ie=UTF8&qid=1524403817&sr=8-4
Updated 4/23/2018
Fusion 360 file
https://a360.co/2qYM0u6
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License:
Creative Commons - Attribution