It's a JG. I haven't chrono'ed it, but I don't think it's firing 390-450 like the description says. I have a new m115 spring that I can include if needed.
Here's the description from Evike. Mine has some half rails though.
DESCRIPTION : JG M16 DMR / M16 RIS Full Size AEG Rifle .
PACKAGE INCLUDES : Battery, Charger , Manual, Cleaning / Unjamming Rod and AEG.
DIMENSIONS : LONG: 1001mm WEIGHT: 3900g
VELOCITY : 390~~450 FPS / Maximum effective range: 120 feet
MAGAZINE : 300 ROUNDS
GEAR BOX : Version 2 (Metal Gear Box)
HOPUP : ADJUSTABLE
BATTERY : LARGE TYPE
* Metal M16 R.I.S.
* Metal Outer Barrel
* Full Stock For Large Battery
* Working Charging Handle
* Metal Hi-Cap Magazine
* Detachable Carrying Handle