Odin Works Barrel, Fits AR15, 223 Wylde, 16.1, Threaded 1/2-28, ULTRAlite Profile, Stainless Steel, Mid Gas Length, Includes Tunable Gas Block B-223-16-UL-ML-TG 223 Wylde is a hybrid of the 223 REM and 5.56. 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.