Yes.
yes
Well for about $140 you can get the g&g m4 on evike.com
it seems like no one knows.
yes it very well should.
One would be able to find out more information about m4 airsoft guns online on Amazon. Two other sites that have some information about m4 airsoft guns are wikiHow and HobbyTron.
It all depends on preference. I personally like ECHO 1 and G&G.
No. It is considerably lighter than it's real steel counterpart.
Nope
No one will give you an M4 rifle/carbine for free.
The M4 3181 AEG is always nice. Here's a link: http://www.hobbytron.com/AirsoftAssaultRifleGunAEGWAA10CH3181.html
I highly recommend the M4 or the M16. They have great accuracy, and they don't jam. Also, the HK416 is a good choice.