Do your PMAGs feed? In RS, PMAGs don't fit because of the 416's magwell angle. They also don't fit in my 2008 JG HK416.
Also to my knowledge, the US "special force" unit that use it is CAG (mostly known as "Delta Force").
@RaisinBran: There's 3 HK416 versions made by JG (most other manufacturers do the same).
-Front wired one (the one in this review) with the LE stock
-Rear wired with HK417 (crane-like) stock
-Rear wired with full (M16-like) stock