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This Matched Rise Armament Striker Gen 2 Lower and three caliber marked assembled upper receiver set is precision CNC machined from 7075-T6 aluminum and is Mil-spec component compatible. Included is a upper tension screw, bolt catch screw, and forward assist screw. The three assembled upper receivers are caliber marked as .223 WYLDE, 300 AAC BLACKOUT & 6.5mm GRENDEL. This model has a black hardcoat anodized finish. from Ground Zero Precision (Product RA-STR2BLK-3UP-PHOTOGRAPHY)

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