The BSF Barrels Carbon Fiber .300 Blackout AR-15 Barrel (brand part no. SF3IYT0095) is a 14.5-inch semi-auto barrel chambered in .300 Blackout and built with BSF’s carbon fiber-wrapped construction for a lighter, faster-cooling upper. BSF turns a precision 416R stainless steel match-grade core, then tension-wraps it in a carbon fiber sleeve with an air gap between the layers to pull heat away quickly. .300 Blackout is prized for running both supersonic and heavy subsonic loads reliably out of the same short-barrel AR-15, and this barrel’s 1:7 twist is built specifically to stabilize the heavy 190- to 220-grain subsonic bullets that make suppressed .300 Blackout shooting work. At 14.5 inches, it’s a common length for pinned-and-welded configurations that keep a rifle at 16 inches of total barrel length.

Key Specifications

• Cut to 14.5 inches, a common length for pinned-and-welded configurations reaching 16 inches of total barrel length.
• Core turned from 416R stainless steel for match-grade accuracy and corrosion resistance.
• Wrapped in tension-wound carbon fiber to cut significant weight versus an all-steel barrel of the same contour.
• Built with an air gap under the carbon wrap for faster heat dissipation during rapid strings of fire.
• Chambered in .300 Blackout, built to run both supersonic and heavy subsonic loads reliably.
• Rifled with a 1:7 twist, matched to the heavy 190- to 220-grain subsonic bullets common in suppressed .300 Blackout shooting.
• Built for semi-auto AR-15 platform uppers.

Frequently Asked Questions

Why does this barrel use a 1:7 twist? It’s built to stabilize the heavy 190- to 220-grain subsonic bullets that make suppressed .300 Blackout shooting reliable.

Can this barrel run both supersonic and subsonic .300 Blackout ammo? Yes, .300 Blackout is designed to cycle both supersonic and subsonic loads reliably in the same AR-15 platform.

Why is 14.5 inches a common barrel length? It’s the standard length used in pinned-and-welded configurations that bring total barrel length to the legal 16-inch minimum for a rifle.

Buy the BSF Barrels Carbon Fiber .300 Blackout AR-15 Barrel

Order the BSF Barrels Carbon Fiber .300 Blackout AR-15 Barrel from our Lubbock, Texas gun shop for fast, direct shipping. It’s a lightweight, fast-cooling option for shooters building a dedicated .300 Blackout upper. Check out the full BSF Barrels AR barrels lineup for more lengths, twist rates, and chamberings.