Aero Precision M4E1 Threaded Complete Upper 5.56 18 Barrel

Aero Precision M4E1 Threaded Complete Upper Features The 18-inch CMV barrel is made from 4150 CrMoV steel with a QPQ finish ensuring outstanding durability and resistance to corrosion. Featuring a rifle-length gas system a 1:7 twist rate and an A2 flash hider this barrel delivers consistent performance with various ammunition types. The low-profile gas block enhances reliability and complements the clean aesthetics of the build. The 15-inch ATLAS R-ONE M-LOK handguard offers a lightweight and slim profile with full M-LOK compatibility for versatile accessory mounting. Its integrated quick disconnect sling sockets provide added utility for sling setups. The M4E1 threaded receiver includes laser-engraved T-marks M4 feed ramps and pre-installed port door and forward assist for out-of-the-box readiness. Note: This complete upper does not include a BCG or charging handle allowing for user customization. Aero Precision M4E1 Threaded Complete Upper Specifications Manufacturer: Aero Precision Model: M4E1 Threaded Complete Upper Receiver Cartridge: 5.56 NATO Barrel Length: 18 Gas System: Rifle-Length Barrel Material: 4150 CrMoV Steel with QPQ Finish Twist Rate: 1:7 Handguard: 15 ATLAS R-ONE M-LOK Compatible Receiver: M4E1 Threaded Anodized Black Gas Block: Low Profile .750 Journal Thread Pattern: 1/2x28 (A2 Flash Hider Installed) Features: M4 Feedramps Laser Engraved T-Marks Port Door and Forward Assist Installed Lightweight ATLAS R-ONE Handguard (1.3 ID 1.5 OD) Quick Disconnect Sling Sockets