Luth-ar AR-15 Complete Upper Features The Luth-ar AR-15 Complete Upper starts with a 20 fluted bull barrel machined from 416 stainless steel a profile chosen to add rigidity and mass that reduces felt recoil and helps the rifle settle faster between shots. The 1:9 twist rate is matched to stabilize heavier .223 Rem projectiles giving long range shooters a dependable platform for precision work. Fluting cuts weight from the bull profile without sacrificing the stiffness that keeps groups tight as the barrel heats up. The M4 feed ramps on the receiver ensure smooth reliable feeding across a wide range of ammunition. The A3 flattop receiver arrives complete with the bolt carrier charging handle forward assist and ejection port cover already installed cutting down on separate parts a builder would otherwise need to source. A low profile gas system keeps the upper s silhouette slim under the handguard and the 15 Palm Handguard adds M-LOK slots along with a continuous Picatinny top rail for mounting optics lights and other accessories. The black hardcoat anodized aluminum receiver resists wear and corrosion through heavy range use. Built for shooters chasing precision out of a heavy barreled AR-15 this complete upper is available for sale at GrabAGun. Luth-AR AR-15 Complete Upper Specifications Manufacturer: Luth-AR Model: AR-15 Complete Upper Caliber: .223 Rem Barrel Length: 20 Barrel Finish: 416 Stainless Steel 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 Barrel Description: Fluted Bull Available At: GrabAGun