Selling my m4 build due to wanting a hpa set up

this m4 was originally plastic but changed upper and lower receiver to metal with shorter metal rail and shorter outer barrel to allow for suppressor to sit inside the rail. 
 

Upgrades:

high torque motor 

hop up 

hop up rubber

Barrel

gearbox is still standard apart from spring. Spring had been changed due to shooting way over limit. It’s shooting around 342 fps on 0.2g, I’m more than happy to chrono it on 0.25/0.28g 

£300 might not post due to never posted a airsoft gun before. Northamptonshire based