||I just got this gun...Out of the box, it worked perfectly. It is very well made [all metal], but a bit heavy (about 10lbs). This gun is definitely worthy of its price. I put an apple about 60 feet away and i was hitting it consistently on full auto as well as on semi. It comes with a sweet black mag, which never wobbles, to fit its already awesome full metal body. I have had no problems with the Zombie Killer so far, and its built well.
I haven't taken it to a field yet, but it looks to be shooting around 360fps, which is pretty sweet.
Mags aren't loose
Fits all m4 mags
The battery is very easy to get into the stock (I use a 9.6v butterfly type and it works great)
May be a little loud, but a suppressor always helps out
Battery isn't included
The lower part of the RIS is a little wobbly, but not enough to be a big deal
Rating: [5 of 5 Stars!]