Looks like a well.
Airsoft Forums UK
Lord_Metile
SimonQuigley
Doesn't look like any well M4 i've seen, and the upper reminds me of a VLTOR; http://s4e5fc2d16a332.img.gostorego.com/809E82/cdn/media/s4/e5/fc/2d/16/a3/32/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/m/u/mur-1a_left_side.jpg
Lord_Metile
Wait, looks to MLG to be well. I think it's WE Tech.
SimonQuigley
Is that good..?
DEDSEC
I agree with Lord, looks like a WE M4 GBB. Do you know if it's electric or gas?
SimonQuigley
The guy said electric, shooting around 330
Lord_Metile
How much did it cost, and yes, WE is a great brand (except their glocks. I hear they break very easily.)