Received this gun about a month ago and now have enough experience with it to write a review.
When I pulled the gun out of the box I took a look at the ASGI chrono slip showing that it had been clocked at about 350fps. I was shocked at first, seeing as the site page advertised 380-400, however after getting some playtime in I was more than reassured of it's power. The hop up works perfectly once dialed in and gives you an incredibly accurate and consistent shot. The body seems a bit strange, near the mock bolt catch the body bulges a little bit. I'm not worried about it but be aware of it, I have 2 other buddies with G4's and they all have this bulge as well. The blowback system is awesome, it always resets to the forward position unlike most blowback AEG's. The only problem I had was that ASGI had forgotten to put the iron sights on my gun when they shipped it out, though a quick phone call sorted that out. A+ for customer service. The internals make hardly any noise, they sound well tuned and have not failed me yet. All in all, the G4 series of guns is the best M4 airsoft gun on the market. I can't think of any reason not to buy it really, unless you HATE plastic bodies.
Shoots hard, perfect for field play
Ideal rate of fire, not too fast, not too slow
Blow back system is great
Best customer service I have experienced
Plastic body, though I don't mind some of you might not like that
Rail system was not quite aligned right, easy fix though
The butt plate is PAINFUL to remove, use tools
Battery space is a bit tough when trying to fit a 9.6v 2000mah nunchuck
Rating: [5 of 5 Stars!]