The Proof Research AR-Style Barrel 300 Blackout 12.50" Pistol Length Gas System 1:8" Twist 5 Grooves, 5/8-24 tpi, Carbon Fiber Wrapped delivers precision and rugged performance for AR platform builds, combining a lightweight carbon fiber wrapped exterior with proven bore geometry to optimize velocity, accuracy, and heat management. Built for AR compatibility, this 12.5-inch pistol-length barrel features a 1:8 twist and 5 grooves with a 5/8-24 thread pitch, ensuring reliable stabilization of common blackout projectiles while maintaining balanced cycling and reduced muzzle rise during rapid fire. The carbon fiber wrap provides a stiff, heat-dissipating profile that resists thermal distortion, helping maintain point-of-impact consistency across extended strings of fire. As a purpose-built component for 300 Blackout applications, it enables clean aiming through tight groups, whether youre setting up a precision rifle for woodland hunts or configuring a compact, maneuverable AR capable of delivering steady performance in varied environments. This barrels exacting workmanship supports accuracy-focused builds, mounting cleanly on compatible receivers and delivering the enduring rigidity needed for reliable field performance. Add this carbon fiber wrapped option to your AR build to achieve a lighter, thermally efficient profile without compromising stiffness or accuracy.