ZRODelta 17.76 LVOA 16in .223 Wylde Non-Threaded Barrel Black Medium. 223 Wylde with a 1/8in twist for maximum durability and accuracy. Specifications for ZRODelta 17.76 LVOA 16in .223 Wylde Non-Threaded Barrel: Manufacturer: ZRODelta Color: Black Finish: Nitride Caliber: .223 Wylde Barrel Length: 16 in Barrel Profile: Government Barrel Material: 4150 CMV Steel Gas System Length: Mid Length Barrel Twist Rate: 1-8 Package Contents: ZRODelta 17.76 LVOA 16in .223 Wylde Non-Threaded Barrel ZRODelta 7046-0061-1367: 17.76 LVOA 16in .223 Wylde Non-Threaded Barrel Black Medium