M4 note.
I ordered a replacement M4 trigger group from Airsoft Buddy, and it doesn't include part 66, or its spring.
I was also able to mod a WA Tango Down pistol grip to fit the WE. Requires a decent amount of dremmelling, but it fits.
Lastly, the Daniel Defense Mk18 RIS II "grade A" version from Ebaybanned fits perfectly on WE uppers. The rail lined up spot on, and the supplied barrel nut is the appropriate length and thread spacing. Incase you are curious, the barrel nut is too short to fit my WA Clone Jing Gong/Golden Eagle M4.
I have a complete summary of a bunch of GBB parts in a thread on GasGuns.info. If you want more details head on over and look in the WETI thread. Too detailed to repeat here.
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