The Luth-AR 24-inch Fluted Bull Barrel Complete Upper (brand part no. FTBL-B24) is a bench-ready AR-15 upper chambered in .223 Remington/5.56 NATO, built around a fluted bull barrel machined from 416 stainless steel. A 1-in-9 twist rate stabilizes a wide range of bullet weights, while the A3 flattop receiver arrives complete with bolt carrier, charging handle, forward assist, and ejection port cover installed. A low-profile gas system and 15-inch ergonomic palm handguard with KeyMod slots and a full-length Picatinny top rail round out the package for optics and accessories. It is built for precision shooters who want a heavy, accuracy-focused barrel without assembling an upper from parts.

Key Specifications

• Chambered in .223 Remington/5.56 NATO for wide ammunition availability.
• 24-inch fluted bull barrel adds mass for heat management and accuracy during longer strings of fire.
• Machined from 416 stainless steel for corrosion resistance and a smooth, precision bore.
• 1-in-9 twist rate stabilizes a broad range of .223/5.56 bullet weights.
• A3 flattop receiver includes bolt carrier, charging handle, forward assist, and ejection port cover.
• Low-profile gas system keeps the sight plane clean for optics mounting.
• 15-inch KeyMod handguard with a full-length Picatinny top rail adds mounting real estate.
• Sold as a complete upper, ready to drop onto any mil-spec AR-15 lower.
• A3 flattop design accepts standard optics and flip-up sights without an adapter.

Frequently Asked Questions

Does this upper come complete and ready to fire? Yes, it includes the bolt carrier, charging handle, forward assist, and handguard already assembled.

What twist rate does it use? A 1-in-9 twist, suited to a wide range of .223/5.56 bullet weights.

Will it fit any AR-15 lower? Yes, it is built to mate with standard mil-spec AR-15 lower receivers.

Buy the Luth-AR 24-inch Fluted Bull Barrel Complete Upper

Finish out your precision build with a heavy-profile upper that is ready to shoot the day it arrives. Order the Luth-AR 24-inch bull barrel upper from our AR15 uppers selection, and our Lubbock, Texas team will get it shipped fast.