RED-85-Z51
Addicted to ArboristSite
While your cleaning up your 520 see if you can confirm your answer on what that part is made out of.
It's metal.
The only plastic is the top cover, bar cover, and recoil. The rear handle, AV cradle is plastic, which includes the fuel tank.
Same with the CS-440.
The CS400 and 370, that peice is plastic. I confirmed that at the Echo school.