20 x 42 x 12mm bearing using 6mm BB's
MetalTac Airsoft BBs .25g Perfect Grade High Precision 6mm BB Pellets
https://www.amazon.com/MetalTac-Airsoft-Perfect-Precision-Pellets/dp/B001BMOBD8/ref=sr_1_3?ie=UTF8&qid=1524528780&sr=8-3&keywords=metaltac+airsoft+bbs
Updated on 4/23/2018
Fusion 360 File
https://a360.co/2KaIlSL
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License:
Creative Commons - Attribution
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