Ah, I missed that deal as I already had ordered this AR10. I also don't know enough about the gen2 to feel secure in completing an 80% and having it work. I'm figuring buying a rady made lower and upper from PSA should give me a high % of success. what I've seen from the AR10 platform so far is that unlike the AR15 platform there are so many 'standards' to choose from and teh risk of inadvertently matching incompatible parts is high.
On the good side, the upper should be in my hands Monday and the lower reach my FFL on Tuesday. I found some Magpul M3 Sr25 20 round mags for $13.99 and ordered 6 of those ($12 shipping).
On the bad side, no handle yet on a sweet deal on ammo for this beast. Some German surplus (most likely from the 70's or 80's) for $0.49 shipped a round doesn't sound like a real deal. I'm hoping like the gen2 and the mags, an ammo deal will pop up shortly.