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Aero Precision M4E1 Threaded 18" 6.5 Grendel Complete Upper Receiver with 15" ATLAS R-ONE Handguard - Anodized
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AR-15 16" M4 Contour Barrel, 6.5 Grendel Type 2, 1:8, Stainless
AR-15 18" Heavy Barrel, 6.5 Grendel Type 2, 1:8, Stainless
AR-15 18" Heavy Barrel, 6.5 Grendel Type 2, 1:8, Straight Fluted, Stainless
Aero Precision M4E1 Enhanced 20" 6.5 Grendel Complete Upper Receiver - APAR640232M53