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Well, there are performance and cosmetic upgrades. Your 'extras' were basically mild performance / reliability upgrades, and are pretty cheap. Most of my upgrades to date for my M4A1 were to convert the gun to a C8. I installed those particular gears not for an upgrade, but because I blew the stock TM gears and wanted to get good quality torque-up, reinforced gears to avoid problems down the road. I still plan on adding some internal upgrades like Systema piston, spring guide, piston head, cylinder head, nozzle and tappet plate. Probably will add a Systema high speed motor down the road too. That will be another sack of cash down the road. lol
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