Ian McCollum of Forgotten Weapons provides an expert-level review of the Colt Model 621, an export-oriented Light Machine Gun variant of the M16A1. He details its heavy barrel, adapted M60 bipod, and unique receiver markings, highlighting its historical context as an attempt by Colt to penetrate foreign markets. The review emphasizes the rarity of these firearms, noting their production by the Colt Custom Shop and occasional appearance on the collector's market as transferable NFA items.
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