Well dunno what kind of AEG your working with but you may just be better off buying one of those complete gearbox's from Redwolf. You can get one with an M150 spring completely assembled for $242.00. If you don't wanna fork out the money for a systema motor, Guarder has one that it equivalent to them for half the price. Last but not least you'll definitely need to purchase a bigger battery if you want to utilize the maximum performance of the AEG. I went the route of purchasing all the parts and realize now I would saved a ton of money buy just purchasing that Systema set.
my $.02 anyways
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