What is the best M4 full mech box?
 

Thinking about upgrading my compression system and mech box. Who makes the best full mechbox (rear wired) that would fit a VFC M4? What would be the best motor to match it with?

The VFC mechbox shell is fine, just change out the internals. VFC compression components are fairly good out of the box.

Motor would depend on your setup and what your RoF goals are.

no company makes everything perfect
the systema mechbox is close, but even it's lacking in some areas
you just can't beat a good home build.

The one a good tech built.

change out the compression components in the vfc box.

There are things one tries not to touch in a gun to preserve working conditions...

the gearbox shell, the trigger mechanism, sometimes the nozzle (but vfc is fine) and sometimes the hopup (but vfc is fine)

compression on stock VFC components is already really good... you should investigate where you're leaking from before spending money. 100$+ on a complete mechbox and it won't be any better compression than what you have now.... and if you properly diagnose the system maybe all you need is a 5$ nozzle.

+1 it's not the box it's the tech.You either have to change a lot or nothing depending on the noise it makes and the weather tomorrow.