Mack

Was the kids mate an umpa loompa or did they just have a really dodgy spray tan?

You could get one prebuilt for less than that already. But if you did want to build your own id go with either a G&P or VFC CQBR with colt trades.
 
http://www.proairsoftsupplies.co.uk/acatalog/M4-MK18-Mod-I-Black--with-553-Red-Green-Dot-Sight--AEG-G-P-GP_AEG038BK.html

Kit pic from my last game.

Taiwangun as you already said. Everywere else will be more expensive.

That looks rough as a badger!

You don't need to switch out anything, least of all the slide.

Ambi controls are more important than switching out parts that don't need changing, likely to the detriment of the gun IMO.

CQB - you're doing it wrong.

You've left some rail space, you could fit another sight on there. Wasteful

I have plate carrier setups that weight a lot less than the chest rigs many people run. This airsoft myth that weight is defined by equipment type needs to die.. it should've already (a long time ago). The weight and bulk of your load bearing equipment depends entirely on which rig you buy, the materials used in it, types of pouches you attach, the way those pouches are constructed and most importantly, above anything else, the equipment you put in those pouches.
 
Sure if you don't want anything on your back and aren't bothered about the coverage then don't get a PC, it's a few extra grams of cordura you don't need; but that picture you've used gives a rather biased impression.
 
If the weight of fabrics is a concern I wouldn't buy a combat shirt either. If the wearer is worried about coverage then standard PCS/BDU shirts that don't have the t-shirt material in the body are the better standard option, especially when not wearing a PC. Though either one is preferable to a hoody if you don't wanna swim in your own sweat, doubly so as the weather begins to warm up.

You can fit any length Free Float you like, unless you are keeping the triangle frontsight.

I think people get carried away with how good their guns are hence why it's so common to see people saying how their gun outranges 90% of people on site. As much as I love my HK416 it's accurate out to 50-55 metres(on 0.25g blasters), which is the same as what any decent AEG should be doing.
 
Up to you if you want to do it but changing the hop rubber and fitting a tight bore barrel made a very small difference at best. I treat it as a learning experience but outside of that I would say it was essentially a waste of money. Here is the thread I made on doing this if you are interested: http://www.airsoft-forums.co.uk/index.php/topic/23985-tm-hk416-barrel-and-hop-change/#entry174059
 
The next option is going to be looking at upping the FPS so it's closer to 350 FPS. Not that it's 100% helpful to you now but Fire Support offer an upgrade package which is both a more powerful spring and a Lonex gear set so they recommend changing both, but that package is limited to new guns:
http://www.fire-support.co.uk/product/firesupport-marui-sopmod-scar-recoil-m4-340-fps-upgrade
 
Personally I think it starts getting a bit messy and I would take it to someone that messes about with TMs for a living, for instance my mate has just bought a HK416 and it's due back this coming week after a few hundred quids worth of work done on it. However that's what I would do to my gun, if you are feeling adventurous then go for it - There's also a few guys on here that know a lot more about recoil shock upgrades than I do(which isn't hard) so might be worth seeing what they say too.

There's only so much you can expect from any AEG. You are flinging a plastic ball after all. The rule of diminishing returns definitely applies with AEG upgrades.

Guy had one of those at our local yesterday. They are noisey little things!

Take it to a shop/tech.
 
Without wanting to be rude you sound like you don't know enough to not screw it up completely.
 
But to be honest it's either a bent barrel or the hop/rubber/barrel are misaligned.

It's on a real gun so I don't think it's a WE China clone

Yeah baby.

CQB M4 in any flavour. Length is only 680mm with stock retracted. Infinite amount of upgrade parts and spares available.
 
Just to give you an idea on sizing
 
M4 CQBR/Mk18 stock retracted: 680mm
Mp5A2, MP5A4 : 680mm
MP5SD2, MP5SD5 : 790mm
MP5SD3, MP5SD6: 670mm
MP7 stock extended: 640mm
p90: 500mm

Was the kids mate an umpa loompa or did they just have a really dodgy spray tan?

Likewise:
 

I guess this can go in here

lol sniper RIFLE

Guy had one of those at our local yesterday. They are noisey little things!

Was the kids mate an umpa loompa or did they just have a really dodgy spray tan?