Luth-AR AR-15 Complete Upper Features The Luth-AR AR-15 Complete Upper is built around a 16 barrel machined from 4140 chrome moly vanadium steel a durable alloy chosen for its ability to handle sustained firing without excessive heat-related wear. A 1:9 right-hand twist rate stabilizes standard weight 5.56mm bullets effectively making the upper well suited to common training and defensive ammunition. The barrel threads 1/2x28 at the muzzle giving builders the option to add a muzzle device of their choosing. An M4 feed ramp cut into the receiver improves feeding reliability across a range of magazine types and ammunition. The A3 flattop receiver ships complete with the bolt carrier group charging handle forward assist and ejection port cover already installed saving builders the time and expense of sourcing those parts separately. A low-profile gas system keeps the operating system compact and unobtrusive beneath the handguard while cycling the action reliably. The ergonomic 15 M-LOK handguard provides ample real estate for lights grips and other accessories while the integrated Picatinny top rail runs the length of the upper for easy optic mounting. Finished in black hardcoat anodize for corrosion resistance and weighing 4.45 lbs the Luth-AR AR-15 Complete Upper is a ready-to-install option for anyone building or upgrading an AR-15 rifle. Luth-AR AR-15 Complete Upper Specifications Manufacturer: Luth-AR Model: AR-15 Complete Upper Caliber: 5.56mm Barrel Length: 16 Barrel Material: Chrome Moly Vanadium Twist Rate: 1:9 RH Handguard: M-LOK Receiver Description: M4 Feed Ramp Receiver Material: Aluminum Receiver Finish: Black Hardcoat Anodize Thread Pattern: 1/2x28 Weight: 4.45 lbs Available At: GrabAGun