Aero Precision M4E1  5.56x45mm NATO Hardcoat Anodized Black APAR600201AC 

The M4E1 upper receiver is a one-piece design combining the handguard mounting platform with the upper itself. It is machined from 7075-T6 aluminum with, M4 feedramps, .250 takedown pin holes, and supports barrels with a diameter up to 1". Included is a barrel nut and wrench, port door, and forward assist. This model has a black hardcoat anodized finish. 

NOTE: This upper is not piston-kit compatible.

• M4 Feedramps
• .250 takedown pin holes
• Lazer engraved T-marks
• 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 Anodized Black
• Port Door and Forward Assist installed
• Barrel nut
• Barrel nut wrench