The 6520 is not in the 2011 catalog. The A2 does have its limitations on a modern carbine.
Also, the old 9mm RO635 and RO639 models with A1 carry handles are gone too. Replaced by the R0991 and R0992 which have KAC rails, and Matech BUIS
Though the Colt 6720 is a nice replacement, but it doesnt appear in the Colt 2011 catalog either.
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