The Proof Research AR-Style Barrel (brand part number 100387) is chambered in .223 Wylde, a hybrid chamber that shoots both .223 Remington and 5.56 NATO safely while improving accuracy over a standard 5.56 chamber. Machined to 11.5 inches with a rifle-length gas system, 4-groove rifling, and a 1:7 twist rate, it is built from a stainless steel formulation chosen for high tensile strength alongside the toughness needed to withstand extreme chamber pressures, along with excellent erosion and corrosion resistance. The muzzle is threaded 1/2-28, ready for a muzzle device or suppressor.

Key Specifications

• Chambered in .223 Wylde, safely running both .223 Remington and 5.56 NATO with improved accuracy.
• Barrel length is 11.5 inches.
• Gas system length is rifle-length, unusually long for a barrel this short.
• Rifling twist rate is 1:7 with 4 grooves.
• Muzzle is threaded 1/2-28, ready for a muzzle device or suppressor.
• Material is stainless steel, chosen for tensile strength and erosion/corrosion resistance.

Frequently Asked Questions

What is .223 Wylde and why does it matter? It is a hybrid chamber that safely runs both .223 Remington and 5.56 NATO while improving accuracy over a standard 5.56 chamber.

Is this barrel itself an NFA item at 11.5 inches? No, a bare barrel is not itself regulated. Installing an 11.5-inch barrel on a shouldered, stocked rifle lower under the 16-inch federal minimum requires a registered SBR; it is legal without registration on a pistol-configured build.

What gas system length does it use? It uses a rifle-length gas system.

Buy the Proof Research 223 Wylde Barrel

Get a tough, corrosion-resistant short barrel for your next build. Shop more Proof Research barrels in our parts selection, and this barrel ships fast from our Lubbock, Texas gun shop.