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Depends... are you looking for performance upgrades or just to make it last longer? If you're short on cash then I'd definitely follow the "don't fix it if it ain't broke" philosophy. Then you can keep saving that money towards a better gun.
There's a lot of talk about the gearbox being the weakest spot in the G&G's but that's a lot of work, especially if you don't know what you're doing.
If yours is a blowback model you may want to disable that and get a lower spring as it puts unnecessary wear and tear on the gun.
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