This 270AR is pushing the envelope of an unmodified AR-15. That is where it is of interest to those who are interested in getting everything out of an AR that they can. As Constructor said, it's just a wildcat, but wildcats are cool, especially when they are viewed within the constraints of the platform for which they are intended.
Its not an unmodified AR15 either though... The .800 series bolts are .800 in dia where a AR15 bolt is .750. The lugs at the root are wider than a AR10 bolt and they are made from 9310 where AR10 bolts are 8620. During the destruction lab test in 2009 the Armalite AR10 bolt broke before the 800 series did. The bottom lugs are clearanced because they stick down further than a AR15 bolt. If there wasn't .025" taken off the tips they would catch the 30 degree shoulder on the cartridge in the mag. Where the root of the lug attaches to the body of the bolt is where the strength is not out on the tip. The reason it is mentioned is so anyone seeing the flat spot on those 2 lugs may understand why it is there.
