The first Colt Heavy barrel was the Colt 606 with four different upper configurations and with the early 1 in 12 twist. The buffer was solid plastic (I think)
Got my upper in the late 90's as...
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The first Colt Heavy barrel was the Colt 606 with four different upper configurations and with the early 1 in 12 twist. The buffer was solid plastic (I think)
Got my upper in the late 90's as...