I have a Tactical Machining .308 lower. Its been built up with real nice, but is still awaiting an upper. TM does make runs of matching .308 uppers that look nice, but they're a small shop and have been overwhelmed with the 80% market. I've asked repeatedly about when they will make more, but they don't know. They are DPMS compatible, and I've been tempted to just pick up a JD Machine upper, but concerns about tolerances and different manufacturers has stopped me from doing so.
I bought it late last year before the elections, having a sense of what was coming. I also knew I was moving to California and would likely not have another opportunity for a while.
If I could do it again, availability dependent (they weren't at the time), I would have bought a MA-TEN matched set and avoided the whole compatibility issue. Mega makes very nice stuff.