AGD doesn't have 100% confirmation. Doesn't sound like NXL has given much input.
Then in the comments AGD said in response to if they had discussed with the NXL:
I have tried to talk to the NXL a couple times via email. They ignore me. I just don't see an issue in their rules. The guns can operate within the rules.....Who knows what they will actually do when a Pneumag steps up. All I can say is that a GOG Enmy is gas operated Pneumatic trigger. If they are allowing that, then how can they deny any others. Just don't push the boundaries. Make sure the gun cannot run away fire.
And I'd imagine the Autocockers given away are Empire/GI Resurrections. Simon has mentioned wanting to support mech play, so Inception guns aren't out of the question though.