The Luth-AR FTBL-B20M 20" Bull Barrel Complete Upper Receiver Assembly is built for shooters who demand consistent precision from their AR platform. This upper pairs a 20-inch fluted bull barrel made from 416 stainless steel with a black A3 flattop receiver, delivering a rigid, heat-resistant setup that maintains accuracy over extended strings of fire. The stainless barrel, 1:9 twist rate, and included bolt carrier group and charging handle make this a ready-to-install solution for upgrading a compatible lower into a dedicated accuracy-focused rifle.

Designed around a low-profile gas system and a 15-inch Palm Handguard with M-LOK slots and a Picatinny top rail, this upper offers ample mounting space for optics and accessories while keeping the front end stable and controllable. Its .223 Remington chambering and bull barrel profile make it well suited for range work, varmint hunting, and precision target shooting from the bench or bipod. Luth-AR’s attention to detail and proven manufacturing quality are evident throughout this assembly, providing a dependable foundation for a refined AR build.

Key Features:

• Manufacturer: Luth-AR
• Model: FTBL-B20M
• Caliber: .223 Remington
• Barrel Length: 20"
• Style: M-LOK Handguard With Picatinny Top Rail
• Barrel Description: Fluted Bull, 416 Stainless Steel
• Twist Rate: 1:9" Right Hand
• Receiver Finish: Black Hardcoat Anodize
• Thread Pattern: 1/2"x28