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Aero Precision APAR612201AC: This upper receiver features the same tried-and-true construction and aesthetics as Aero Precision's M4E1 Enhanced Upper Receivers, without a forward assist. This upper is designed to work with Aero Precision's Enhanced handguard for ease of installation and for superior strength when completed.
Ease of installation - Simply insert your barrel assembly into the M4E1 upper, tighten it using the provided barrel nut and wrench, slide your rail on and tighten the rail screws. Within minutes you have a modular, free-floated rail.
Features: