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This incredible complete 300 Blackout upper receiver features Aero Precision's M4 upper and Ground Zero Precision's popular Tac-Hunter Keymod Handguard! Key features include the addition of quick disconnect sling sockets, enhanced milling design for grip and visual appeal and a new profile for the picatinny top rail. from Ground Zero Precision (Product gzp-16-fde-300blk-tac-upper)

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