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Dorian, barrel twist is 1 in 9 with 6 grooves and lands and threaded 1/2 x 28.

1:9 twist see ******Action: Semi Auto Caliber: .223 Rem / 5.56mm NATO Capacity: 30+1 Finish: Hardcoat Black Anodize Bolt Material: Carpenter 158 Steel Receiver: M4A4 Type Flat Top Upper w/Handle Receiver Material: 7075 T6 Aircraft Aluminum Stock: 6-Position Telescoping Buttstock Grip: A2 Black Plastic Sights: Adjustable Safety: Manual Lever with Indicator Markings ********Twist: 1:9 Barrel: 16 Heavy Chrome Lined w/A2 Suppressor Overall Length: 36.125 Weight: 7.45 lb License Requirement FFL Manufacturer Windham Weaponry Mfg. Part Number R16A4T UPC 848037000019 Caliber/Gauge .223 / 5.56 Action Semi Automatic Barrel Length 16