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Features:1pc free float designBuilt in anti-rotation tabsScalloped railsContinuous top rail1.72" inside diameter fits most muzzle devices and 1.5" suppressorsCompatible with low profile gas blocksGen 2 Feature - Quick disconnect sling socket at the 3, 6 and 9 oclock positionsGen 2 Feature- Additional milling along flats to aid with gripping and add visual appeal Gen 2 Feature - New profile for the continuous picatinny top rail Designed to perfectly fit Aero Precision Enhanced M4 Upper Receivers Includes barrel nut for attaching to standard AR-15 upper receivers from Ground Zero Precision (Product AERO-12-AR15-ENH-MLOK-HG)

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