I'm thinking of upgrading some of my guns for a better performance during airsoft games. Since I know that I can't afford all the airsoft parts I need to do that yet, I'm going to start with one of my AEG rifles. Right now, I'm using a Tokyo Marui AK47.  Which airsoft parts do I need to upgrade a Tokyo Marui AK47? How much do these parts cost? Of course, since I'm all thumbs at upgrading guns, perhaps you could also give me some instructions on how to go about it. 

The Tokyo Marui AK47 is a really cool gun. Unlike the one with the metal folding stock version, this can accomodate a large battery in its hollow stock. This means that it can store an 8.4-volt battery if it is required for an upgrade. This rifle can fire full automatic and semi-automatic rounds that has a velocity of 285 feet per second. As it is, you have a very strong gun that can hold 68 BB's in its mag.

Of course, since we always want to have the best on the field, upgrading this rifle is a very good idea. Before you could start, you should make sure that the airsoft parts that you need are complete. You’ll need a Systema/Area1000 metal bushings, a Guarder Shim Set, a Guarder 50% Hopup Bucking, a Guarder Ball Bearing Spring guide and a PDI 150% Spring. You will also need the following tools: a Torx T10 screw driver, Phillips head screw drivers of various sizes, flat head screw drivers of various sizes and a cloth or knife. Having an extra pair of hands during the process is very important. You should try to schedule this activity during the weekend so that you'll have a bigger population of hands to choose from. The airsoft parts indicated above are very cheap and can even be purchased online. The tools, on the other hand, can be found in do-it-yourself shops and hardware stores.

The first step involves disassembling the rifle. One should always make sure that the battery has been removed before doing this. After this has been done, the stock and faux wood grip cover should be taken out using the screw driver. After the stock has been removed, the wire that is connected to the battery should be removed. The upper receiver is next. This can be done by pushing the button that can be found at the back of the gun. The separation of the front set from the receiver follows this step.

Before working on the gear box, the hopup bucking should be changed. In this step, the hop up housing is removed and the inner barrel is pulled out of the rifle. When replacing the hop up backing, the hop should be turned down and the small piece of plastic near the front of the gearbox should be removed. After the rifle has been prepared to receive the new hop up buckling, it is then inserted and the rifle is reassembled.
It sounds a bit complicated without pictures so it would be a good idea to go online in order to look for pictures of the parts mentioned.