[Drakker]

Range an accuracy can probably be fixed by a simple hop-up rubber swap. G&G uses notoriously bad hop-up rubbers in their lower end products. Also, disassembling, cleaning and greasing an AEG will not fixes problems with it, it's basic maintenance, but it has no effect on accuracy whatsoever. Changing the gearbox is expensive and will not do much either unless your compression is REALLY bad, like, when you chrono it, you get +-50 fps or worse. Buying a new gearbox that is over half the price of a gun is also a bad idea, keep that money for a better gun.

First, you'll need to disassemble only your barrel group, that is hop-up unit and inner barrel. Make sure the barrel is clean, you can use microfiber clothes or at last resort, kitchen paper towel, to clean the barrel and do it until the patch comes out perfectly clean. Then check the hop-up rubber, if its black, trash it, its not worth using, if its green, which is should not in their low end products, you can keep it, it's their good rubber.

So, if its the green one, clean it thoroughly with dish washing soap to remove all grease/oil on it. Then reassemble the hop-up unit correctly, not forgetting to put the little nub back in, and enjoy your newfound accuracy.

If it's a black rubber, trash it as I said earlier. Buy a better hop-up rubber, everyone has their favorite brands, for me, Maple Leaf rubbers have worked amazingly well. Get one that is not too hard, 60-70? is good. Install that, following the instructions above, and enjoy good accuracy.

So, now that you got your barrel group fixed, buy high quality BBs, at least 0.28g, 0.30g and 0.32g are even better. Now enjoy very good accuracy AND range.

Next, the most crucial part, don't mess with it, and don't buy random upgrade parts. Most cheap upgrade parts on the market are complete trash that are more likely to make your gun worse than better. A lot of newbies will tell you to change your inner barrel, don't. A good inner barrel costs a lot, cheap upgrade barrels are likely to be worse than your stock barrel. If your compression is really bad, only 4 parts will help, the piston head, the cylinder head, the loading nozzle and the hop-up rubber. But buying all those parts to put in a low end gun is a bad idea, you might as well save your money and use it to buy a higher end gun later that doesn't need any upgrades. Upgrading a low end gun or buying a high end gun comes around to the same price anyway, so don't waste your money on this gun. Use it until it breaks, or use it as a loaner when you get something better, but don't put any money in it. It's a good gun for starting and to get a feel of the sport, but don't expect it to perform like a Lamborghini.