My apologies in advance for raising a thread from the dead...
I also have a new AAC 300blackout. But it's a 9" barrel.
It shoots really pleasant with nice accuracy.
However, I was also getting a lot of FTE during my first outing after putting it together. Tried a carbine buffer and H2. Same problem all around. Folks on 300blktalk.com mentioned that one finicky thing with the 300blkout is that there needs to be an o-ring on the extractor spring. Most BCG's, such as my DD do not come with one, or it is included as an option, but not installed form manufacturer. Adding the .01cent o-ring solved my FTE problems, and now she runs like a champ with sub and super sonics.
Can anyone else chime in?, and tell us if that is a common problem with 300blkout and running an original 556 BCG? just give it an extractor spring o-ring
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