Specna Arms M249 metal version good 4-5kg with a loaded box mag.

Upgraded with the following,

Perun mosfet, deans connector 
Rocket silent cylinder head & piston (mushroom)
ASG ultimate nozzle 
SHS metal tooth piston
ZCI stainless steel cylinder 
ZCI 16:1 advance gears
ZCI anti reversal latch 
Guarder clear bucking 
ASG ultimate boost custom 30k motor 
Prometheus M110 spring 

AOE correction and shimmed this was from PB pre upgraded so comes with the standard motor, piston head etc in the box.

Chronographed today bang on the joule limit, had 10k rounds through it with no issues. Only thing I'd do now is the bic biro nub mod to give it more hop adjustment.

Comes with the box (not pictured) original metal bipod, fore grip bipod, Titan 3000mah 7.4v battery in peq box, 2500 box mag, metal bullets. Included is the blue Rocket tappet plate as the original one felt stronger/better material so left it in. 

Only selling as its not my play style anymore and it don't fit in the cupboard anymore with my other RIFs. Can included another Titan 3000mah PEQ 7.4v battery for an extra £20

£350 ono would prefer collection from Kent, CT10 BUT could post at cost or meet as work all over Kent. More photos/videos on request.