The Odin Works ULTRAlite 16.1" 223 Wylde barrels are extremely slim and only weighs 1lb 6.6oz! The 223 Wylde is a hybrid of the 223 REM and 5.56. A 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.