The Luth-AR Fluted Bull Barrel Rifle Kit (brand part number RKB163) delivers nearly everything needed to build a complete AR-15 around a 16-inch fluted bull barrel, short of the stripped lower receiver itself. Built by Luth-AR, the .223 Remington barrel is machined from 416 stainless steel with a 1:9 right-hand twist and button-broached rifling, threaded 1/2×28 and fitted with an A2 flash hider. The kit ships as a fully assembled upper with a 15-inch vented KeyMod palm handguard, a complete lower parts kit, and your choice of an MBA-1 fixed or MBA-3 adjustable buttstock assembly, so builders only need to supply a Mil-Spec stripped lower receiver.

Key Specifications

• Barrel length is 16 inches, with a fluted bull contour for weight reduction.
• Barrel material is 416 stainless steel with button-broached rifling.
• Twist rate is 1:9 right-hand, threaded 1/2×28.
• Handguard is a 15-inch vented KeyMod palm handguard.
• Includes a complete lower parts kit for finishing the build.
• Choice of MBA-1 fixed or MBA-3 adjustable buttstock assembly.

Frequently Asked Questions

Is the lower receiver included? No, this kit does not include a lower receiver; Luth-AR recommends sourcing a Mil-Spec stripped lower separately.

Can I add a drop-in trigger to this kit? Yes, Luth-AR offers optional add-ons like a Velocity drop-in trigger to complement this build kit.

Buy the Luth-AR 16-inch Fluted Bull Barrel Rifle Kit

Build a complete AR-15 around a lightweight fluted bull barrel. Order this AR-15 build kit from our Lubbock, Texas gun shop for fast, insured shipping to your door.