The Diamondback 5.56 NATO 5.5-Inch Pistol-Length Barrel (brand part number DB556P5.5H50B8-R) is built to replace a worn barrel or finish out a short AR pistol build chambered in 5.56x45mm NATO. Machined from 4150 chrome moly vanadium steel and finished in black nitride for corrosion resistance and easy cleaning, this barrel pairs with a pistol-length gas system for reliable cycling in a very compact package. It’s a straightforward, no-frills barrel for shooters building a true AR pistol.

Key Specifications

• Chambered in 5.56x45mm NATO.
• Measures 5.50 inches in barrel length, ideal for a compact AR pistol build.
• Machined from 4150 chrome moly vanadium steel for strength and heat resistance.
• Finished in black nitride for corrosion resistance and a low-maintenance bore.
• Cut with a 1:8 twist rate, matched to common 5.56/.223 bullet weights.
• Built around a pistol-length gas system for reliable cycling in a short-barrel configuration.

Frequently Asked Questions

What gas system does this barrel use? It’s built around a pistol-length gas system, matched to the 5.5-inch barrel length.

What twist rate does this barrel have? It’s cut with a 1:8 twist, a common, versatile choice for 5.56/.223 bullet weights.

Is this barrel finished for corrosion resistance? Yes, it’s finished in black nitride over 4150 chrome moly vanadium steel for durability and easy maintenance.

Buy the Diamondback 5.56 NATO 5.5-Inch Pistol-Length AR Barrel

Finish your compact 5.56 pistol build with a barrel and gas system matched for reliable short-barrel performance. Order the Diamondback barrel from our AR barrels selection, and our Lubbock, Texas team will get it ready to ship as soon as it’s available.