Cheap M16/M4 GBBs

Recently, I've hit a bit of a brick wall as far as money for airsofting goes, but I still need a good GBB M16/M4 for when Oak Flats opens up, so I've been looking at Redwolf's selection of AGMs and the JG M4. Do you guys think it's worth it?

edit: Screw the AGMs. I just watched a review on youtube that disappoints me a lot. Any suggestions then?

Do you really need a GBB..? And your G36 isn't enough for field? I kinda like the WE SCAR which is, frankly, the only mass-produced and mass-available GBB assault rifle I've ever seen. Too bad it's not an M16 haha.

I love gas guns because of the simplicity and the reliability. I can use my G36C, but I want to replace it for field games. I'll still use it for CQB and carry it as a loaner or as a fall back gun. I like the SCARs, but it just doesn't go with my loadout.

Okay guys, I just found the KJW/Tanio Koba M4A1 on Redwolf, complete with a review. It appears this is the best cheap M4A1 out of the box on the market. I spoke with the guy at my gun shop, and he says he can order me just about any GBB-R I want, with the exception of the Inokatsus. What do you guys think about the KJW/Tanio Koba M4A1?