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[ARCHIVED THREAD] - chrome lined?

Posted: 5/30/2008 12:14:44 PM EDT

I have a 20" hbar a2 upper with no forge marks and only 5.56 on the barrel how do i tell if it is chrome lined or not and what the twist rate is? and who made the upper the only oter marks I cn find are the letters M P on the carrier group

[ARCHIVED THREAD] - chrome lined?

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