Just to add my 2 cents to the conversation. I bought a G&G M4 CQB/R for my starter, had it for a couple of months, not issues...did just upgrade the barrel. When 6in longer on the barrel, and put a silencer on it.
I would not say that G&G makes the best quality, but they are definately night and day compared to CrapSoft from CT. I would recommned one to anyone as a starter gun. I plan on getting an Ares Tavor eventually to replace it, but she is serving me well in the mean time.
"Sero Sed Serio"