This video from Brownells features a product spotlight on their BRN-601 Retro Upper Receiver Assembly. Presented by Brownells Gun Tech Caleb Savant, the video highlights this upper as a modern, detail-exact replica of the original Colt Model 601, the first AR-15/M16 variant to enter U.S. military service. The review details numerous authentic features, including the three-pronged flash hider, slim barrel profile with 1-12" rifling, non-F-marked front sight, green triangular handguard, slim Delta ring, and an A1 rear sight. It also notes the absence of a forward assist and shell deflector, mirroring the original design. The video emphasizes the use of modern materials and manufacturing for durability while maintaining historical accuracy.
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