Fixed.

My KJW MK1 although not full metal has been through hell and is no worse for the wear. It's been dropped, gotten wet, mags swelled from heating up after filling in cool air then getting far too hot in the sun. put them in my vice (very carefully with wooden blocks) and squeezed them back to normal. Plus you can "ghetto upgrade" it for free and get over 500fps out of it if you wanted. cons are it fits loose in most holsters and no blowback(better on gas though). I also have the carbine and they use the same mags so thats a plus. I've had for at least 5 yrs and only now I'm replacing 3 out of 6 mag fill valves ($3 each, 30 seconds to switch).