you know every time you read this you have to ask yourself if "parts are just parts" I am guessing none of the 4 Bushmasters had any of the currently available made in China parts in them. Its always a good read as 10,000 rounds of some pretty crappy ammo is a lot through a barrel. You have to wonder if a Colt or a Daniel Defense or Noveske would do any better and you have to wonder if an Eagle Arms AR15 would do any worse.
http://www.luckygunner.com/labs/brass-vs-steel-cased-ammo/#erosion 
