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X Products XUP-M4CC-BLK: X Products Slab Side Upper XUP-M4CC-BLK. X Products Slab Side Monolithic Upper Receiver AR-15 M4 Carbine Profile Black Anodized Forged 7075 T6 Aluminum Continuous Rail Top Picatinny Handguard Integrated Design Lightweight Strength Accurate Barrel Alignment Reliable Gas Key Fit Durable Hardcoat Premium Build XUP-M4CC-BLK Upper Ultimate.
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X Products Slab Side Upper M4 Black!