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Bearing bushings are only good when you want a really fast ROF gun. Same for high torque gears; they are meant for guns like MP5 with small batteries and strong springs.
Silent head is simply not needed. Not bad to have it, just not needed.
What you need; metal bushings, a spring. The rest is fine. Check the stickied posts. For the record, I own two Marui AK's, both work fine.
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