talk to GMeyer about his WE AR15s. I went from not wanting a WE gun of any sort, to getting a 416 done by him. The gun shoots 1" groupings with iron sights at 35', has the same recoil as a C7 on blanks, and is very reliable. He has done some amazing work with those guns.
Now I currently own a WE 416, XM177, and an M16 that has to go see Mr. Meyer for internal tweaks.
Believe me, though the KJW is best out of the box, the WE has a lot of aftermarket parts that lets you build it to your own specifications. As well as the ability to take real steal buffer tubes, sling plates, stocks, grips, etc.