The Stern Defense .45 ACP 10.5-Inch Barrel (brand part number 00645ACPBARREL105INCHD) is a pistol-caliber AR barrel chambered in .45 ACP, machined from 4150 chrome moly steel and finished in black Melonite for corrosion resistance and a low-maintenance bore. At 10.5 inches, this barrel is built for a compact AR pistol build running the .45 ACP cartridge, giving builders a purpose-cut replacement or upgrade barrel from a company that specializes in pistol-caliber AR components.

Key Specifications

• Chambered in .45 ACP.
• Measures 10.50 inches in barrel length.
• Machined from 4150 chrome moly steel.
• Finished in black Melonite for corrosion resistance.
• Cut with a 1:16-inch twist rate, matched to standard .45 ACP bullet weights.

Frequently Asked Questions

What twist rate does this barrel use? It’s cut with a 1:16-inch twist, the standard rate for .45 ACP bullet weights.

Is a 10.5-inch pistol-caliber barrel legal to own on its own? Yes, a bare barrel is an ordinary Title I part. Since it’s under 16 inches, it should only be installed on a pistol-configured AR build or a properly registered SBR lower, not a shouldered rifle-configured lower.

Buy the Stern Defense .45 ACP 10.5-Inch AR Barrel, Black Melonite

Build or rebuild your .45 ACP AR pistol with a purpose-cut barrel from a pistol-caliber specialist. Order the Stern Defense barrel from our gun accessories lineup, shipped fast from our Lubbock, Texas gun shop.