Aero Precision M4E1 5.56 Nato 16" Green Upper Receiver APAR700178M7

This complete upper features the R-ONE Handguard, engineered with minimal size and weight in mind while still offering ample real estate for accessories. Designed for performance and reliability, the Aero Taper Lock Attachment System delivers a secure, modern, and slim mounting solution without sacrificing strength or stability.

Includes:

• M4E1 Threaded Assembled Upper Receiver – OD Green Anodized

• 15" R-ONE M-LOK Handguard

• 16" 5.56 CMV Barrel

• Low Profile Gas Block and Mid-Length Gas Tube

• Fully assembled and ready for installation

M4E1 Threaded Upper Receiver Features:

• Enhanced forging for a billet-like appearance

• Picatinny rail blends seamlessly with Enhanced Series Handguards

• M4 feed ramps

• .250 takedown pin holes

• Laser-engraved T-marks

• Port door and forward assist pre-installed

R-ONE Handguard Features:

• Full-length Picatinny top rail

• QD sling sockets at 3, 6, and 9 o’clock

• Compatible with low-profile gas blocks

• 1.3” internal diameter, 1.5” external diameter

• Works with mil-spec AR15 upper receivers and barrels

16" 5.56 Barrel Specs:

• 16" 4150 CMV, QPQ finish, 1:7 twist rate

• 5.56 NATO chamber, mid-length gas system

• .750 gas block journal, .0785 gas port

• M4 feed ramp extension

• HP and MPI tested

• Standard A2 flash hider installed