I got my tax stamp on Friday, after 5 months for my Form 1 to get approved. I drove EVERYWHERE today to find a decent, yet not too expensive upper so I could fire it today. I finally found a Stag Arms 11.5, and I had to drive 2 hours to get it. I wasn't expecting my stamp to take 5-ish months...I was prepared for 7-8 months. Go figure. Specs here: http://www.stagarms.com/product_info.php?cPath=14_42&products_id=347 Anyway, pretty much the only thing I don't like is the VERY thick barrel profile. I shot 100 rounds of XM193 through it, and 25 rounds of M855 through it. This m-f'er is LOUD, but that's probably due to the Troy muzzle break I put on it. It shakes the ground at my buddies house. We took it into the woods to his little range/dirt mound, and went to town. The concussion is insane, and the flash is CRAZY! I'm in love! The Troy muzzle break works VERY well. I was doing double taps with very little muzzle rise. I'm now officially addicted to NFA stuff, but I'll have to wait until I get back to VA after ETS'ing from the Army to get more NFA toys. (I'm headed to Korea in Jan, then I'm DD-214'ing the eff out!) The Stag upper was clearly test-fired from the factory, and everything was top-notch. The extractor had the o-ring and such, and the bolt and barrel are marked "HP/MP", along with the F-marked front sight post. Barrel is a 1/7 twist. Overall, I'm VERY satisfied with the upper. Upon closer research, supposedly these SBR uppers come from Stag's LE division, which supposedly takes extra care of them. Based on its performance today, I'd believe it. I had no issues whatsoever, except having the ground underneath me shake due to the muzzle break. I'm pretty sure this thing is louder than a Barrett. .....and yes, I'm an inconsiderate *******. If you don't like loud noises, get another hobby. ....the concussion isn't THAT bad, and with my Peltor's, it didn't require 2 layers of ear pro. Then again, I was shooting outside, in a wooded area. YMMV. Pics- Wanna kill these ads? We can help!