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Quoted: Who makes CMMG barrels and what quality steel are they? Are there bolts and carriers DPMS?
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There barrel steel is 4150
I donn't beileve there BCG is DPMS because it is the enhanced carrier with the suraded firing pin.
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Just got my first CMMG upper. The BC is definitley not DPMS. Firing pin is shrouded.
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I believe CMMG uses CMT BCG's. Is there what looks like a line going across the bolts holding the key in??
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You mean the improperly staked gas key screws? If so, that's probably a CMT/Stag BCG. That said, I don't know of many people that had to re-stake their CMTs, but RRA and Colt do it differently, as does Bushmaster IIRC. I do not know about DPMS, but Tweak's thread covered a variety of different staking methods. CMT's staking method was an example of what not to do.