Aero Precision M4E1 Threaded 16" Upper 5.56x45mm 1:7 M-LOK Rail Mid-Length, Black

This complete upper features the advanced Atlas S-One handguard, designed to optimize both weight and size for the perfect addition to a lightweight build. Engineered for shooters who demand durability without excess bulk, the S-One line delivers exceptional strength and reliability while maintaining a sleek, streamlined profile. The proprietary Atlas attachment system ensures a rock-solid mounting platform, providing stability and precision in every shot. Built for those who value performance and innovation, this complete upper enhances handling, accuracy and overall shooting experience with a refined balance of strength and agility. New enhanced forging that gives the upper receiver a "billet look'', offering improved aesthetics and strength New picatinny profile that blends seamlessly with our enhanced series handguards, ensuring a clean and functional setup M4 feedramps ensure that the rounds feed smoothly into the chamber, enhancing cycling reliability and preventing jams during use Has 1/4 inches takedown pin holes Laser-engraved t-marks offer precise and clear markings, ensuring quick identification and seamless installation for accessories and parts The package includes the port door and forward assist already installed, offering easy setup and immediate use without additional assembly The front and rear picatinny rails offer secure mounting points for accessories like optics, lights or lasers, enhancing customization and functionality The center of the top rail is eliminated for weight reduction, improving overall firearm handling and balance without compromising strength The indexing grooves in the 12:00 position provide a positive grip control, ensuring that users can maintain a secure and stable hold for better precision Quick disconnect sling socket at the 3, 6 and 9 o'clock positions, offering flexible sling attachment options Designed to fit low-profile gas blocks, ensuring proper alignment and function for reliable shooting performance Features a 1.30 inches inside diameter Has a 1-1/2 inches outside diameter Compatible with Mil-Spec AR-15 upper receivers and barrels, offering a solid, reliable connection for a secure fit and maximum performance The 5.56 x 45mm 16 inches mid-length barrel features a 1:7 twist, made from 4150 CrMoV steel, QPQ treated and has a drilled gas port Features a 3/4 inches gas block journal Featuring a mid-length gas system with a 0.0785 gas port, this system provides smoother cycling and optimal performance for a variety of shooting conditions The M4 feed ramp extension ensures reliable feeding and smooth cycling by directing rounds into the chamber with precision and ease HP and MPI testing ensures that the firearm components are of the highest quality, free from defects and tested for durability and performance under high stress conditions Standard A2 flash hider, a standard muzzle device designed to reduce visible muzzle flash, improving concealment and reducing the shooter's signature during low light conditions