I wish, I had bought a fun custom 80% receiver after agreeing to go in on a GGer with a few friends and they all flaked.
I wanted to do the colt a1 style m16 80% for a retro build too but I think the engraver got told to stop selling them
Its one of the mattel marauder receivers, its a nice looking paper weight for now though since I dont feel like blowing 300-400 on tools to macchcine it out with a router and since receivers are stupid cheap as well. Not a bad "problem" to have.
Is the GG2 the one that can do 1911s as well?
eta:
looks like this