Original Magpul PTS Masada ACR AEG 
These are not common and the build quality awesome with a mix of polymer and metal. It is front wired and battery sits within the hand guard (included a 11.1v lipo). 
Package includes all in the pictures:
Magpul PTS Masada ACR AEG in black (some parts were painted TAN)
magpul flip up sights,

Battery
2x extra Polymer hand guards Magpul Pts
1 magpul PMags replica high cap
 

The original barrel has a 14mm CW thread so l have fitted an adapter to 14mm CCW.
The gearbox is a tank, was greased and shimmed. It has a quick spring change, l have installed a standard mosfet and a high torque motor from SHS. It has a micro switch trigger with click sound (very tactile and precise) and fitted with a new hopup rubber. Shooting at @300 fps now