Aero Precision M4E1 Assembled Upper Flat Dark Earth .350 Legend 20″ Barrel

Aero Precision M4E1 .350 Legend Upper Features

This upper is built around Aero’s M4E1 threaded upper receiver, which boasts a billet-style aesthetic and enhanced forging with laser-engraved T-marks, forward assist, and port door pre-installed. The included ATLAS R-ONE handguard provides a slim, lightweight profile with full Picatinny top rail, QD sling sockets, and robust compatibility with low-profile gas blocks and mil-spec AR-15 parts.

The 20-inch .350 Legend barrel is crafted from 4150 CMV steel, featuring a DMR profile, carbine-length gas system, and M4 feed ramps for reliable cycling. It’s HP and MPI tested for durability and capped with a standard A2 flash hider. This upper is ideal for straight-wall cartridge hunting setups or anyone wanting serious knockdown power in a precision platform.

Aero Precision M4E1 .350 Legend Upper Specifications

• Manufacturer: Aero Precision
• Model: M4E1 Assembled Upper
• Series: .350 Legend
• Caliber: .350 Legend
• Barrel Length: 20″
• Barrel Material: 4150 Chrome Moly Vanadium (CrMoV)
• Barrel Profile: DMR
• Gas System: Carbine-Length
• Gas Block Journal: .750
• Gas Port Size: .0785
• Twist Rate: 1:16
• Feed Ramps: M4
• Flash Hider: A2 Style (9mm)
• Receiver: M4E1 Threaded Upper (FDE Finish)
• Handguard: ATLAS R-ONE (Full Top Rail, QD Sockets)
• Inside Diameter: 1.3″
• Outside Diameter: 1.5″
• Construction: Assembled (No BCG or Charging Handle)
• Compatibility: Mil-Spec AR-15 Lowers and Components