Aero Precision M4E1 Enhanced Forged Assembled AR15 Upper Receiver - FDE Cerakote

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: M4 Feedramps .250 takedown pin holes Comes assembled, with dust cover and forward assist installed M4E1 Specific Details: Handguard mounting platform is forged into the receiver Compatible with Aero Precision Enhanced and Quantum Series handguards but also fits most BAR-system handguards Barrel nut and wrench are included These uppers are not piston-kit compatible Will support barrels with a diameter up to 1" Includes: AR15 M4E1 Upper Receiver in FDE Cerakote  Port Door and Forward Assist installed Barrel nut Barrel nut wrench SPECS Specs Made In America? Yes Platform AR15 Material Machined from 7075-T6 forged aluminum Finish Magpul FDE Cerakote Compatibility Works with standard AR15/M16 components Weight(s) 10.24oz Other Barrel Nut Torque - 55 ft-lbs