Below is the description of the item in question.
The Magpul AFG-2 M-LOK Adapter Rail is a polymer M-LOK accessory rail that is optimized for the attachment of the Magpul AFG-2 to all M-LOK compatible hand guards and forends. Molded of the same high quality material as other Magpul Polymer Rails, the AFG-2 M-LOK Adapter Rail has the same footprint as the AFG-2 and lower profile than a standard Picatinny rail to ensure a seamless transition between the different components.
I am wondering if it works it AFG Gen-1. I don't see why not but just want to make sure.
Sorry I should have been more clear.