Odin Works .223 Wylde 7.5in Pistol Barrel. About 100 rounds through it or less. Adjustable gas block. Features Length: 7.5" Profile: Medium Gas placement: Pistol Pistol Rifling: Button 8 twist Weight: 15oz Made from 416R Stainless Steel M4 Feed ramps 1/2-28 Threading 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. $150 obo