it's a stag 2ht upper. i wasn't sure if i liked it at first but after seeing it in a local shop, i thought it looked really clean and much better than similar uppers by other manufacturers.
i ended up buying from http://www.lanworldinc.com. They carried it for $625 which was $70 cheaper than anywhere else i could find. At any rate, i'm from Cali and this is a huge deal for me. it's like buying 3 XD's all at once (with the 30 day wait in CA, i'll never get to feel that).
By the way, if you have one of these, can you give me your thougts on EOTech or Aimpoint? i can't decide cuz i really like both.