Upgrading externals on m4

so i have decided to keep my JG m4 so i want to upgrade some things and the first is the front and i was wondering if this http://www.airsoftpost.com/complete-front-assembly-tokyo-marui-classic-army-echo1-p-26174.html would go on this http://www.airsoftpost.com/lipoly-ready-stubby-airsoft-assault-pistol-reinforced-black-metal-gear-p-29642.html ?

also how long is it does anyone know so i can get an inner barrel too with it no sepratly

From the looks of it, I can't see it fitting.Maybe if you got a much longer inner barrel...

well the front piece does it screw on or "pop" on? if need be i'll post a pic of the thread

does anyone one know if the back part screws on the thread of the gun or the length of the barrel so i can get a new inner barrel with it

It will not fit, the Threading for the Lock Ring/Delta Ring are reversed.

The Delta Ring Screws on Clockwise, From the Gun you showed the threading is counter clock wise.

the reciever has a little part not the metal part but the acual reciever

but the acual thing on the reciever i have is CW so is it that or do i need a new piece?

The outer barrel assembly will not match up to the Receiver,

The Locking Ring on the outer barrel that you want to install seats and holds the Barrel to the Receiver, inner clockwise threads,

The receiver on the gun that you showed has a locking ring on the receiver that pulls the outer barrel to the receiver, outside counter-clockwise threads,

Without some MAJOR modifications you will never get these parts to fit together.

With the right amount of pressure, you can fit a Round Peg through a Square hole, but it just doesn´t work the other way unless you make some modifications

that screws off i took it off already and there are some threads on the acual reciever

i asked webmaster he said yes but i'm gonna buy a boneyard gun to up it(better company and cheaper)