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Perfect platform for building the ultimate, mission-specific, AR-15 rifle or carbine. Made from a high-strength, 7075 T6 aluminum forging for reliable performance and outstanding durability.  Mil-Spec, hard anodized finish adds extra strength to the receiver walls and delivers superior abrasion-resistance for rugged field use.  Precision-machined to ensure drop-in installation of Mil-Spec, aftermarket components