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Shaheen Gun Sales LLC CMMG, Barrel Sub-Assembly, 6mm Arc, 16.1

Davidson Defense 'Alpha' 18-inch AR-15 6mm ARC Bead Blasted Rifle

Ballistic Advantage Premium Series AR-15 16 Threaded Barrel Chambered .223 Wylde Deeply Fluted SPR Profile Stainless Steel [FC-819747021403] - Cheaper Than Dirt

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Ballistic Advantage 18-Inch Premium 6mm ARC Barrel - SPR Profile