Looking for some assistance with Upgrades.

I'm looking to do some simple upgrading to the M4 Commando.

I'm not interested in increasing the length(longer barrell) to increase accuracy, i'd like rate of fire up and be right @ 375-400 fps(stay legal).

obviously i'm planning to upgrade the battery i use to a 9.6, any suggestions on type or manufacturer.
do you suggest the big ole bulky battery pack, PEQ?(do i need a laser sight) how much does this really help. over a simple 9.6.

P.S. I'm Cheap. LOL

Well I would suggest investing in a high speed motor and also buy some high speed gears. It is amazing what an upgraded motor can do. My Systema Magnum is great in my CA36c. As far as FPS go, you could upgrade to a heavier spring. A Systema M120 would put you pretty close to what you are looking for. While you are in the gearbox, you might as well put some metal shims in and get the gears moving a little smoother. You may also want to get a new piston with some sort of metal teeth if you plan on getting a stiffer spring with a higher output motor.
Check out this motor: http://www.airsoftsmith.com/store/product_info.php?cPath=39_48&products_id=763
If that one seems a little high priced, you could get this and notice a slight increase as well: http://www.airsoftsmith.com/store/product_info.php?cPath=39_48&products_id=188
Batteries: think of the voltage as ROF and the MAH as the capacity of the battery. With a mini 9.6v / 1200mah you will get the same ROF as a 9.6v / 3000 mah large battery, but you will get about half as many shots per charge. PEQ boxes work really nice if you can put one on your M4. They allow you to have access to the battery a little easier without disassembling the replica all the time.
I have one of these in my PEQ box, seems to do the trick: http://www.airsoftsmith.com/store/product_info.php?cPath=26&products_id=198
Accuracy: if you do decide you want some more FPS, range, and accuracy, you should consider a tightbore barrel. Systema makes a nice barrel for the money that is a 6.04mm and you can find them in any length. You will notice a significant increase in accuracy.
http://www.airsoftsmith.com/store/product_info.php?cPath=39_45&products_id=152

Hope that helps.

awesome, You are the man. Do you know of any good sites that have any tutorial's on upgrading. I've had my stuff apart, and i know how it all works, i just would love to check out some step by step upgrading. I think i'll get some wear on the gears and motor before i upgrade them. If i were to upgrade the spring to a 120 would that also require the more powerful motor(would it burn up the stock motor). I may simply upgrade the battery on the M4 and put the Internal upgrades into the VSR-10. BTW was the AEG upgrade subject up when i originally posted this. LOL. i have an awesome habit of posting stuff in the wrong thread.

The upgrade section was there when posted, but no big deal - very easy for me to move

Moved.

The following website is very informative and has all kinds of information related to Airsoft as well as reviews on GBB/AEG/etc...
www.arniesairsoft.co.uk
This link will take you straight to the mechbox tear down link from the same site. It really helps the first couple of times you open one up. http://arniesairsoft.co.uk/articles/skyfire/mechbox/index.htm

Just remember to re-align everything and make sure everything goes back together really nice and easy. Dont force anything. Also another small tip, when you do get ready to open the mechbox, put a small screw driver in the back of the spring guide and as soon as you have enough clearance, remove the spring/spring guide from the back of the mechbox so nothing shoots out at you.

if you need another video tutorial try this: http://www.mechbox.com/site/ < go to JG M733 for diassembly/reassembly vids.

and the motor thing depends on what gun u have(E1, JG, TM, CA) but i think ur talking about the E1 or the JG so yes i would recomend another motor. i think if you want great ROF i would go with the Systema Magnum Speed motor(blue i think, its in seabasses links). but if you realy are that cheap and just want something that will pull a 120 then i would go with the Marui EG1000: http://www.airsoftsmith.com/store/product_info.php?cPath=39_48&products_id=188

hope i helped

sticks

[edit] fixed mexhbox.com URL [edit]

May I suggest the following:

1. Use sanyo nicad sub-c batteries or intellect sub-c batts for the 9.6v the higher the mah the better (eg: 9.6v 2400mah) as mah dictates the length of time you have to play or how many mags you can run thru your aeg before the batts run out. The assumption is that you can fit the sub-c batts in your aeg. If not, any size would therefore do, not unless you want to use a lipoly battery..

2. You will also be needing metal spring guide with or without bearing. Metal bushings or bearing bushings. For the springs you have the ff options. m120 / sp120 / pdi 170. If your aeg is made in mainland China, check and double check your cylinder head. Check if the nozzle is in good condition and that it does not wobble. If so, replace it. You may also want to get an Air Seal nozzle (with o-ring), any brand will do as long as it merges well with the hop assembly as this would give you about 20-25fps

3. Next, check if the hop rubber attached to the barrel is not torn. If it is replace it. Check your cylinder if it is the right one. China aeg tends to use 0-type (meaning no hole on the side). For the m4 length inner barrel it is supposed to be the type 2 (hole on the side) I think your inner barrel is around 300mm length. so you would need a 3/4 hole cylinder type 2..

4. make sure once you assemble all parts that the compression is good. no air leaks..
5. No need to change the gears.. with this setup..

Hope this helps