Is Madull metal compatible with Systema gearbox?

[zollen]

I am interested in the following Madbull metal body, is this metal receiver compatible with Systema Energy/Revolution gearbox or G&P gearbox??

[ILLusion]

In general, almost airsoft Armalite components are cloned on the Marui platform.

Madbull clones Marui.
The Systema Energy/Revolution gearboxes and G&P gearboxes are all designed to be drop in on Marui compatible bodies.

Thus, it can be assumed that these parts should all work together. In practice, you'll find that mixing and matching different brands may present minor fitment problems. Generally, if this occurs, the modifications required to get the parts to work together are minor and are not too intensive to fix as long as you know how to work a file.