ODIN Works 18in 223 Wylde Barrel 3-gun profile rifle gas placement w/tunable GB Stainless Steel 18in. 56. 223 Wylde has a chamber throat that is tighter than the 5.56 achieving better accuracy but still reliably functional with 5.56 ammunition. All DI barrels include stainless steel tunable gas block. Specifications for ODIN Works Wylde Barrels w/tunable GB Stainless Steel: Manufacturer: ODIN Works Color: Stainless Steel Caliber: .223 Wylde Condition: New Package Contents: ODIN Works Wylde Barrels ODIN Works B-223-18-3G-R-TG: 18in 223 Wylde Barrel 3-gun profile rifle gas placement w/tunable GB Stainless Steel 18in