Ahh, yes, Javelin. Comes from the latin word, meaning: "Throw as far away from you as you can". lol. Seriously, though, been one of the more problematic brands I've seen, lately. We got one of the metal bodied m4 versions from the shop, last year. I was hesitant, having never heard ot them. However, externals were really nice, and Jon gave me a price well under the MSRP, so I got one for one of my sons. He loved it. Two things I didn't like were the velocity, (too high) and the ROF, (too low). We had the spring clipped to cgc legal, and added CA 7mm ballbearing bushings. This, along with a 9.6v battery, brought the ROF much higher where we wanted it, and the hop up responded to .20's at this velociy. Then, trigger issues began to arise. After a few times in and out of the mechbox, Chris finally managed to resolve the problem by, what he called, "building up the trigger". (I have no idea) Whatever he did worked, however, it now fires full auto in semi auto mode. No problem for us, though. My boy likes to fire full auto all the time, anyway, and he gets semi auto fire by simply tapping the trigger. Also, Jon was able to get us a spare complete gearbox as a back-up if there's any issues in the future. While Chris had it open, i looked around the gearbox to see what else I might upgrade later on. The cylinder set looked very good, especially the chrome air nozzle, silver plated wiring, and stainless inner barrel. The spring guide and motor, on the other hand, looked to be very low-end. The spring guide not only was plastic, but appears to be a ver.III, with the wider feet. Strange to see in a ver.II mechbox. The motor was your basic, cheap, chinese motor. Eventually, I intend to replace both of these with something better, Marui or Systema maybe, but in the mean time, A.J.'s Javelin is working very well, and he loves it. After all, he's only 8, but he had no trouble chopping his way through an ocean of brain-eating scumbags at last years' zombie hunt event with it. It's his pride and joy, and will still blow the doors off anything his friends have, airsoft wise. (remember, they're 8, too.) If you have one of these guns, I wouldn't give up on it. Once you work the bugs out, they do hold their own. Then again, we might just be lucky it still works at all. lol.