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Markings On Barrel Of Ar 15

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F} I have a SP-1 #943xx 16" barrel and retrackable stock but on the barrel the markings are C followed by MP and then a B what is the B

Thanks

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I have a question regarding 300 whispers

It's an AR Barrel

The barrel is marked SS 300 FB 1X8 I need to some barrel and bolt information

Where can you get a bolt for these I presume the carrier is standard.

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