Aero Precision M4E1 Enhanced AR-15 Upper Receiver with Forward Assist - Black (Color: Black)

Enhanced M4E1 Upper with Internal Barrel Nut The Aero M4E1 Enhanced Upper has a unique design and core function that separates it from standard AR-15 uppers. Instead of the typical threading for a barrel nut, the enhanced upper has a built-in assembly to support Aero Precision's Enhanced Handguards. The internal steel barrel nut supports the [...]