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the bolt carrier is not rated for fully automatic fire
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A better way to put it is that it is not capable of full auto as the lug on the underside of the carrier is machined back just enough that it can;t trip the sear for full auto.
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the barrel is not lined with chrome so it is going to go bad after 25,000 rounds instead of 100,000 rounds.
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You can't really say this. Denny Hansen had an Oly Arms AR that went 80,000 rounds with an unlined barrel. There have been tests where unlined barrels had the chrome start to flake off under 10,000 rounds and fail.