Aero Precision M4E1 Assembled Upper .350 Legend 16″ Barrel

Aero Precision M4E1 .350 Legend Upper (16″) Features

This upper includes the M4E1 threaded upper receiver, known for its billet-style aesthetic and refined structural enhancements. It features laser-engraved T-marks, M4 feed ramps, and comes pre-installed with a port door and forward assist. The paired ATLAS R-ONE handguard offers a lightweight and rigid platform with M-LOK slots, QD sling sockets, and a continuous Picatinny top rail for mounting optics and accessories.

The 16-inch .350 Legend barrel is made from 4150 CrMoV steel with a DMR profile and a carbine-length gas system, delivering reliable function and enhanced accuracy. It features a .750 gas block journal, M4 feed ramp extension, and has been HP and MPI tested for long-term performance. This upper does not include a BCG or charging handle, giving users flexibility for custom configurations.

Aero Precision M4E1 .350 Legend Upper (16″) Specifications

• Manufacturer: Aero Precision
• Model: M4E1 Assembled Upper
• Series: .350 Legend
• Caliber: .350 Legend
• Barrel Length: 16″
• 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
• Receiver: M4E1 Threaded Upper (Black Anodized)
• Handguard: ATLAS R-ONE (M-LOK, Full Top Rail, QD Sockets)
• Inside Diameter (Handguard): 1.3″
• Outside Diameter (Handguard): 1.5″
• Construction: Fully Assembled (No BCG or Charging Handle Included)
• Compatibility: Mil-Spec AR-15 Lowers and Components