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Need some help dating a Colt 606 barrel

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    Need some help dating a Colt 606 barrel

    I bought an upper Colt 606 some years ago when the upper could still be imported, the lower, being selective fire remained in Canada. The upper is without the bolt assist feature and the muzzle has the three prong flash hider.

    As I understand, the C MP marked barrels are 1967 to 1969 and the C MO C barrels are 1969-1971

    My barrel which is a 1 in 12 twist is marked C MP B and think? it might be 1969 - anyone know ? Click image for larger version

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