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Old April 17th, 2018, 12:15 AM   #6
Ski169
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Join Date: May 2012
Posts: 668
Advertised on Colt’s website as heavy barrel and MD compliant. Obviously, since they are being offered for sale. But if anyone asks, straight from their website.
https://www.colt.com/detail-page/m4-...-barrel-pinned
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