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The guy at Bushmaster said "if it did not take off after 10 or 12 rounds there was a problem". As far as ammo I tried Lake City M855. I have owned about 9different AR's and shot thousands of rounds through them (including wolf) and never had one short stroke.

I just got a Bushmaster upper with their Gas Piston retrofit kit installed on it. Took it to the range yesterday and had 2 FTF out of 45 rounds and the bolt only locked back on the empty mag once out of 4 partial mags. I tried 3 different types of ammo. Called the dealer I purchased it from and...

http://www.cnn.com/2007/WORLD/europe/04/17/gun.epidemic/index.html