Originally Posted by L473ncy
Don't forget about the Tanio Koba/KJW GBBR that's coming out (word is a release can be expected in November).
That one is supposed to go for around the $500 mark. I don't know all the details such as mag/aftermarket compatibility but I do know that the M4 is the only model that's going to be offered for now (so if you want an M16 you'll have to get all the parts to convert it yourself).
It's barely tested, it's expensive for what it is, poor aftermarket parts...
OP, i suggest getting something proven unless you have $$$ to spare.